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  Subjects -> ENGINEERING (Total: 2160 journals)
    - CHEMICAL ENGINEERING (186 journals)
    - CIVIL ENGINEERING (168 journals)
    - ELECTRICAL ENGINEERING (93 journals)
    - ENGINEERING (1165 journals)
    - ENGINEERING MECHANICS AND MATERIALS (355 journals)
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CHEMICAL ENGINEERING (186 journals)                  1 2     

AATCC Journal of Research     Full-text available via subscription   (Followers: 3)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 8)
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials     Hybrid Journal   (Followers: 4)
Acta Polymerica     Hybrid Journal   (Followers: 6)
Additives for Polymers     Full-text available via subscription   (Followers: 20)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Advanced Chemical Engineering Research     Open Access   (Followers: 9)
Advanced Powder Technology     Hybrid Journal   (Followers: 16)
Advances in Applied Ceramics     Partially Free   (Followers: 3)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 17)
Advances in Chemical Engineering and Science     Open Access   (Followers: 23)
Advances in Polymer Technology     Hybrid Journal   (Followers: 11)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 5)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 10)
Anti-Corrosion Methods and Materials     Hybrid Journal   (Followers: 5)
Applied Petrochemical Research     Open Access   (Followers: 3)
Asia-Pacific Journal of Chemical Engineering     Hybrid Journal   (Followers: 6)
Biochemical Engineering Journal     Hybrid Journal   (Followers: 9)
Biofuel Research Journal     Open Access   (Followers: 1)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 6)
BMC Chemical Biology     Open Access   (Followers: 4)
Brazilian Journal of Chemical Engineering     Open Access   (Followers: 3)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Carbohydrate Polymers     Hybrid Journal   (Followers: 9)
Catalysts     Open Access   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 6)
Chemical and Materials Engineering     Open Access   (Followers: 1)
Chemical and Petroleum Engineering     Hybrid Journal   (Followers: 9)
Chemical and Process Engineering     Open Access   (Followers: 3)
Chemical and Process Engineering Research     Open Access   (Followers: 5)
Chemical Communications     Full-text available via subscription   (Followers: 31)
Chemical Engineering & Technology     Hybrid Journal   (Followers: 25)
Chemical Engineering and Processing: Process Intensification     Hybrid Journal   (Followers: 10)
Chemical Engineering and Science     Open Access   (Followers: 3)
Chemical Engineering Communications     Hybrid Journal   (Followers: 10)
Chemical Engineering Journal     Hybrid Journal   (Followers: 22)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 18)
Chemical Engineering Research Bulletin     Open Access   (Followers: 1)
Chemical Engineering Science     Hybrid Journal   (Followers: 16)
Chemical Geology     Hybrid Journal   (Followers: 10)
Chemical Papers     Hybrid Journal   (Followers: 3)
Chemical Product and Process Modeling     Hybrid Journal   (Followers: 3)
Chemical Reviews     Full-text available via subscription   (Followers: 159)
Chemical Society Reviews     Full-text available via subscription   (Followers: 33)
Chemical Technology     Open Access   (Followers: 5)
ChemInform     Hybrid Journal   (Followers: 3)
Chemistry & Industry     Hybrid Journal   (Followers: 2)
Chemistry Central Journal     Open Access   (Followers: 5)
Chemistry of Materials     Full-text available via subscription   (Followers: 141)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 6)
ChemSusChem     Hybrid Journal   (Followers: 8)
Chinese Chemical Letters     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemical Engineering     Full-text available via subscription   (Followers: 3)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Coke and Chemistry     Hybrid Journal  
Coloration Technology     Hybrid Journal   (Followers: 1)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 8)
Computer Aided Chemical Engineering     Full-text available via subscription   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 8)
CORROSION     Full-text available via subscription   (Followers: 3)
Corrosion Engineering, Science and Technology     Hybrid Journal   (Followers: 22)
Corrosion Reviews     Hybrid Journal   (Followers: 4)
Crystal Research and Technology     Hybrid Journal   (Followers: 2)
Current Opinion in Chemical Engineering     Open Access   (Followers: 3)
Education for Chemical Engineers     Hybrid Journal   (Followers: 4)
Ekologia : The Journal of Institute of Landscape Ecology of Slovak Academy of Sciences     Open Access  
Eksergi     Open Access  
Emerging Trends in Chemical Engineering     Full-text available via subscription  
European Polymer Journal     Hybrid Journal   (Followers: 43)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Fluorescent Materials     Open Access  
Focusing on Modern Food Industry     Open Access   (Followers: 3)
Frontiers of Chemical Science and Engineering     Hybrid Journal   (Followers: 1)
Gels     Open Access  
Geochemistry International     Hybrid Journal  
Handbook of Powder Technology     Full-text available via subscription   (Followers: 3)
Heat Exchangers     Open Access   (Followers: 1)
High Performance Polymers     Hybrid Journal  
Indian Chemical Engineer     Hybrid Journal   (Followers: 3)
Indian Journal of Chemical Technology (IJCT)     Open Access   (Followers: 11)
Industrial & Engineering Chemistry     Full-text available via subscription   (Followers: 9)
Industrial & Engineering Chemistry Research     Full-text available via subscription   (Followers: 20)
Industrial Chemistry Library     Full-text available via subscription   (Followers: 4)
Info Chimie Magazine     Full-text available via subscription   (Followers: 2)
International Journal of Chemical and Petroleum Sciences     Open Access   (Followers: 1)
International Journal of Chemical Engineering     Open Access   (Followers: 7)
International Journal of Chemical Reactor Engineering     Hybrid Journal   (Followers: 3)
International Journal of Chemical Technology     Open Access   (Followers: 4)
International Journal of Chemoinformatics and Chemical Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Food Science     Open Access   (Followers: 3)
International Journal of Industrial Chemistry     Open Access  
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 3)
International Journal of Science and Engineering     Open Access   (Followers: 7)
International Journal of Waste Resources     Open Access   (Followers: 5)
Journal of Chemical Engineering & Process Technology     Open Access   (Followers: 3)
Journal of Applied Crystallography     Hybrid Journal   (Followers: 4)
Journal of Applied Electrochemistry     Hybrid Journal   (Followers: 12)
Journal of Applied Polymer Science     Hybrid Journal   (Followers: 126)
Journal of Biomaterials Science, Polymer Edition     Hybrid Journal   (Followers: 8)

        1 2     

Journal Cover   High Performance Polymers
  [SJR: 0.374]   [H-I: 29]   Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0954-0083 - ISSN (Online) 1361-6412
   Published by Sage Publications Homepage  [819 journals]
  • Preface
    • Authors: Bruma; M.
      Pages: 513 - 515
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315586288
      Issue No: Vol. 27, No. 5 (2015)
       
  • Composite materials based on poly(N-isopropylacrylamide-co-methacrylic
           acid) hydrogels and calcium carbonate
    • Authors: Doroftei, F; Mihai, M, Sacarescu, L, Fundueanu, G, Simionescu, B. C.
      Pages: 516 - 525
      Abstract: The synthesis of complex functional materials with thermo- and pH-sensitive tunable properties based on poly(N-isopropylacrylamide-co-methacrylic acid) hydrogels with different porosities and pH-sensitive and biocompatible calcium carbonate (CaCO3) was investigated. To control the composites characteristics, two hydrogles with the same chemical composition but different porosities were used, as well as different methods for crystal growth, namely, the adding protocol of inorganic partners (rapid mixing or alternate dipping) or the carbonate source. The morphology of the new composites was investigated by scanning electron microscopy and the polymorphs content by Fourier transform infrared spectroscopy, as compared to unmodified hydrogels. Information on the interface between organic/inorganic materials, the radii of gyration of the scattering objects, their fractal dimension, and CaCO3 porosity characteristics were obtained by small-angle X-ray scattering.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584175
      Issue No: Vol. 27, No. 5 (2015)
       
  • Dielectric and gas transport properties of highly fluorinated polyimides
           blends
    • Authors: Constantin, C.-P; Damaceanu, M.-D, Varganici, C, Wolinska-Grabczyk, A, Bruma, M.
      Pages: 526 - 538
      Abstract: The physicochemical properties of highly fluorinated polyimide blends were studied in order to highlight the advantages of employing a high content of fluorine atoms to tailor the properties of polyimide materials. Thus, dynamo-mechanical analysis was used to evidence the physical phenomena taking place during heating. The trend of storage modulus, loss modulus and loss factor tangent with temperature during and after the α relaxation was explored. The dielectric spectroscopy was carried out to investigate the dielectric behaviour at different temperatures and frequencies and to evaluate the values of dielectric constant, dielectric loss and electrical resistance. The dielectric spectroscopy data were corroborated with the dynamo-mechanical analysis to highlight the sub-glass transitions encountered in these blend films. Dielectric loss diagrams showed sub-glass transitions in the form of and β relaxations mainly due to the segmental mobility of the polymer chain components. The gas separation performance of some of the investigated blends was assesed, and their ability to achieve simultaneously higher gas permeability and higher selectivity was demonstrated.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584181
      Issue No: Vol. 27, No. 5 (2015)
       
  • Photophysical properties of some poly(siloxane-azomethine)s
    • Authors: Tigoianu, I. R; Airinei, A, Ribitsch, V, Gruber, C, Fifere, N, Vlad, A, Cazacu, M.
      Pages: 539 - 545
      Abstract: The responsive optical properties of some poly(siloxane–azomethine)s incorporating 1,8-dihydroxyanthraquinone units (PSA1 and PSA2) toward various metal ions (nickel (Ni2+), copper (Cu2+), silver, zinc, ferric, manganese, calcium (Ca2+), chromium, cadmium, barium, magnesium, lead, mercury, strontium, and cobalt) were investigated by steady-state and time-resolved fluorescence techniques. The fluorescence quenching has shown a significant deviation from the Stern–Volmer linearity due to the effect of combination of dynamic and static quenching for PSA1 in the presence of metal ions. Generally, the fluorescence decay is described by a two-exponential relation. The fluorescence of these PSAs was efficiently quenched by Cu2+ and Ni2+ ions, and these derivatives could be investigated as a promising system for the development of new sensors for the detection of Cu2+.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584186
      Issue No: Vol. 27, No. 5 (2015)
       
  • Organic-inorganic hybrid nanomaterials based on inorganic oxides and a
           mesomorphic polyazomethine
    • Authors: Perju, E; Ghimpu, L, Hitruc, G, Harabagiu, V, Bruma, M, Marin, L.
      Pages: 546 - 554
      Abstract: Organic–inorganic hybrid materials have been obtained by impregnating a mesomorphic polyazomethine into a porous inorganic matrix of zinc oxide (ZnO), tin dioxide (SnO2), or mixed ZnO/SnO2. The porous inorganic matrix has been obtained by magnetron sputtering technique and proved a very high crystallinity degree. The resulting hybrid materials were characterized from morphological and optical points of view by scanning electron microscopy, atomic force microscopy, and ultraviolet-visible and photoluminescence spectroscopy. The inorganic matrix itself exhibited a highly rough surface, which became smoother after polymer impregnation, indicating its complete coverage. The violet emission of the separate inorganic and organic components turned into a blue and green light emission, respectively, of the hybrid materials, suggesting the possibility to modulate the color of emitted light by the simple choice of the inorganic matrix. Considerations with regard of interface phenomena that prompted the photophysical changes of the hybrid materials were done.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584172
      Issue No: Vol. 27, No. 5 (2015)
       
  • Preparation approach effect on polyurethane/montmorillonite nanocomposites
           characteristics
    • Authors: David, G; Drobota, M, Simionescu, B. C.
      Pages: 555 - 562
      Abstract: Segmented polyurethane/montmorillonite (MMT) nanocomposites have been obtained by solvent casting or in situ polymerization approaches using poly(tetramethyleneglycol), α,-dihydroxylated poly(2-alkyl-2-oxazoline), 4,4'-methylenebis-(phenyl isocyanate) and MMT. The influence of the preparation method on the characteristics of the resulted materials was studied by means of spectral and thermal analysis, X-ray diffraction, scanning electronic microscopy, and dynamic-mechanical analysis.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584184
      Issue No: Vol. 27, No. 5 (2015)
       
  • Sorption/release of bioactive species in/from cross-linked
           poly(ethyleneimine)/poly(N-isopropylacrylamide) films constructed onto
           solid surfaces
    • Authors: Bucatariu, F; Ghiorghita, C.-A, Dragan, E. S.
      Pages: 563 - 570
      Abstract: Multilayer thin films are useful materials in the fabrication of controlled drug delivery systems and in controlling drug release processes. Herein, we report the step-by-step deposition of polymer multilayers based on poly(ethyleneimine) (PEI) and poly(N-isopropylacrylamide) (PNIPAAm) mediated by pyromellitic dianhydride (PM), as cross-linker of PEI chains, onto Daisogel silica microparticles. The sorption/release properties of the resulting composite microparticles for indomethacin (IDM), diclofenac sodium salt (DS), and Ponceau SS (PSS) were followed as a function of PM concentration. The sorption properties of the [(PEI-PM)/PNIPAAm] n multilayer films for all anionic species (IDM, DS, and PSS) were influenced by the number of polymer layers and the weight ratio between cross-linker and Daisogel microparticles during the cross-linking steps. It was found that the sorbed amount of anionic compounds increased with the number of polymer layers and with the decrease of PM concentration. The Langmuir and Sips model isotherms fitted well the sorption equilibrium data. The maximum equilibrium sorption capacity (q m) evaluated by the Langmuir model, at 25°C, was 41 mg IDM g–1 of Daisogel//[(PEI-PM)/PNIPAAm]8.5 and 40 mg PSS g–1 of Daisogel//[(PEI-PM)/PNIPAAm]8.5, for a weight percentage of PM/silica of 0.1% w/w. Cumulative release of IDM was faster and higher than PSS in the first 5 h, while PSS was desorbed with a constant rate for 30 h, supporting a sustained release from Daisogel//[(PEI-PM)/PNIPAAm] n composite microparticles.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584174
      Issue No: Vol. 27, No. 5 (2015)
       
  • Indolo[3,2-b]carbazole-based poly(arylene ethynylene)s: Modulation of
           their optoelectronic properties by changing the position of substituents
    • Authors: Grigoras, M; Negru, O. I, Solonaru, A. M.
      Pages: 571 - 582
      Abstract: A novel family of indolo[3,2-b]carbazole (ICZ)-based polymers was designed and synthesized using Sonogashira cross-coupling reaction between three bisbromine indolo[3,2-b]carbazoles and 1,4-diethynylbenzene. The new polymers have an arylene ethynylene structure with ICZ moiety interconnected in the main chain by 2,8-, 3,9- or 6,12- positions. The polymers were obtained as partially soluble materials, in chlorinated, aromatic and aprotic polar solvents. The structure of the polymers was studied by spectroscopic methods such as Fourier transform infrared, proton and carbon-13 nuclear magnetic resonance, ultraviolet–visible and photoluminescence spectroscopies, thermogravimetry and molecular weights determined by gel permeation chromatography. Electrochemical properties were investigated by cyclic voltammetry using films cast on platinum disc working electrode. Optical and electronic properties were discussed from the viewpoint of the connection positions of ICZ units in the polymer chain.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584169
      Issue No: Vol. 27, No. 5 (2015)
       
  • The influence of conformational parameters on some physical properties of
           polyimides containing naphthalene units
    • Authors: Sava, I; Bruma, M, Ronova, I. A.
      Pages: 583 - 589
      Abstract: Conformational parameters of some aromatic polyimides–containing naphthalene units have been calculated by Monte Carlo method taking into consideration the hindered rotation produced by voluminous naphthalene units. Several physical properties such as solubility, glass transition temperature (T g), and initial decomposition temperature (T d) have been studied with regard to the rigidity of the chain of these polyimides. It has been shown that T g is well correlated with chain rigidity and with free volume (V fr) of the polymers, while the T d is not influenced by conformational parameters.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584180
      Issue No: Vol. 27, No. 5 (2015)
       
  • Electromechanical properties of polyimide composites containing titanium
           dioxide nanotubes
    • Authors: Hamciuc, E; Ignat, M, Hamciuc, C, Stoica, I, Dimitrov, L, Kalvachev, Y, Olariu, M.
      Pages: 590 - 598
      Abstract: Polyimide composite films were prepared by casting solutions resulting from direct mixing of a poly(amic acid) and titanium dioxide (TiO2) nanotubes (TNTs) onto glass plates, followed by thermal imidization. TNTs with outer diameters of approximately 10–12 nm and length of several hundreds of nanometers were synthesized by the hydrothermal method. The morphology of the nanotubes was investigated by using high-resolution transmission electron microscopy. The influence of TNTs content on structural, thermal, and electromechanical properties of pure polyimide and composite films was studied. The scanning electron microscopy and atomic force microscopy showed good compatibility between TNTs filler and polyimide matrix. The value of average roughness of film surface increases with increasing the content of TNTs. The films were flexible, tough, and exhibited high thermal stability. A study of microelectromechanical properties of these films was performed. The films showed nanometric displacements in the range of 250–800 nm when an electric voltage of 500 V was applied on their surface.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584185
      Issue No: Vol. 27, No. 5 (2015)
       
  • Innovative approach for the synthesis of benzoxazine-modified
           montmorillonite
    • Authors: Andronescu, C; Garea, S. A, Nicolescu, A, Deleanu, C, Eugeniu, V, Iovu, H.
      Pages: 599 - 606
      Abstract: The synthesis of a benzoxazine (BZ) monomer inside the montmorillonite (MT) layers was done using a diamino-modified MT as the amine component, phenol, and formaldehyde. The formation of the BZ rings within the MT layers was investigated by thermogravimetric analysis, X-ray photoelectron spectroscopy, proton nuclear magnetic resonance spectroscopy, and X-ray diffraction, this being enhanced when dioxane was used as the solvent. The morphology of the hybrid BZ monomer was investigated by scanning electron microscopy.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584170
      Issue No: Vol. 27, No. 5 (2015)
       
  • Coordination polymer of copper with a silicon-containing Schiff base:
           Synthesis, structural characterization, and properties
    • Authors: Zaltariov, M.-F; Cazacu, M, Vlad, A, Sacarescu, L, Shova, S.
      Pages: 607 - 615
      Abstract: A Schiff base was prepared by condensation reaction of 2,6-diformyl-4-methylphenol with trimethylsilyl-methyl-p-aminobenzoate and it was further used, without isolation, as a ligand for copper (Cu(II)) ions. The structure of the resulting coordination complex was evidenced by spectral techniques (Fourier transform infrared spectroscopy, nuclear magnetic resonance and ultraviolet-visible spectroscopy) and by single crystal X-ray diffraction, which revealed a covalent one-dimensional (1D) structure where neutral molecular units (Cu(II) coordination polymer [CuL2]) are linked through the bridging oxygen atoms. The 1D polymeric chains are associated by intermolecular C–H···O hydrogen bonding to form two-dimensional supramolecular layers. The polymeric nature of the compound was also supported by the presence of glass transition in differential scanning calorimetry trace. This coordination polymer forms spherical aggregates in a nonpolar medium (hexane) as was emphasized by transmission electron microscopy image taken on the film remained after solvent evaporation. The thermogravimetrical analysis indicates a good stability for the Cu(II) coordination polymer and the biological tests revealed good antibacterial and antifungal activities.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584176
      Issue No: Vol. 27, No. 5 (2015)
       
  • Physical and thermal properties of poly(ethylene terephthalate) fabric
           coated with electrospun polyimide fibers
    • Authors: Butnaru, I; Serbezeanu, D, Bruma, M, Sava, I, Gaan, S, Fortunato, G.
      Pages: 616 - 624
      Abstract: Two analogous polyimides (PIs) containing flexible isopropylidene units were prepared. One was based on 4,4'-oxydiphthalic anhydride and 4,4'-(4,4'-isopropylidenediphenyl-1,1'-diyldioxy) dianiline and the other was based on 4,4'-(4,4'-isopropylidenediphenoxy) bis(phthalic anhydride) and bis(3-aminophenyl) methyl phosphine oxide. The ability of these two PIs to form uniform nanoscaled fibers was investigated by electrospinning technique. At optimal spinning conditions, PI fibers were electrospun onto the surface of woven poly(ethylene terephthalate) (PET) support to form a bilayer composite structure. These new fabric systems were analyzed regarding morphology, air permeability, wetting properties, and thermal stability. It was expected that the new PET/PI mats would possess enhanced properties compared with the initial woven PET fibers due to the excellent properties of PIs. Experimental results showed that PET woven substrate coated with electrospun PI fibers had improved values of air permeability, water contact angle and thermal stability when compared with the initial woven PET fibers.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584178
      Issue No: Vol. 27, No. 5 (2015)
       
  • Synthesis, characterization, and solution behavior of pullulan
           functionalized with tertiary amino groups
    • Authors: Constantin, M; Asmarandei, I, Filimon, A, Fundueanu, G.
      Pages: 625 - 636
      Abstract: The synthesis of cationic amphiphilic pullulan having dimethylaminopropyl groups was performed in dimethyl sulfoxide using N,N'-carbonyldiimidazole as activator. The pullulan derivatives with three different substitution degrees were characterized by FTIR, 1H and 13C NMR, elemental analysis, and conductometric titrations. The aggregates characteristics were determined by steady-state fluorescence (critical aggregation concentration and polarity) and capillary viscometry measurements. Their behavior in aqueous dilute and semidilute solutions was investigated by viscosimetric experiments and fluorescence technique over the concentration range of 0.01–10 g dL–1, as a function of the degree of substitution with pendant groups. Intrinsic viscosity determined using Wolf equations provided information on the conformation of polymer chains. The results highlight the appearance of intramolecular and intermolecular aggregates and the dependence of their characteristics on the degree of substitution with pendant groups.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584182
      Issue No: Vol. 27, No. 5 (2015)
       
  • Thermal behavior, surface energy analysis, and hemocompatibility of some
           polycarbonate urethanes for cardiac engineering
    • Authors: Gradinaru, L. M; Ciobanu, C, Vlad, S, Drobota, M, Butnaru, M, Saint-Pierre, G.
      Pages: 637 - 645
      Abstract: The understanding of basic surface properties and the relationships between temperature and the configuration of the polymer surface are the key to further understand the first interaction mechanism of the polymer with the body. To this end, some poly(carbonate tetramethylene ether)urethane (PCEU), poly(carbonate siloxane tetramethylene ether)urethane (PCSiEU), and their 1:1 gravimetric mixture (PCEU/PCSiEU) membranes were prepared. In order to establish the relationships between temperature and the chemical structure of polymer surface, the polyurethane (PU) membranes were analyzed by attenuated total reflectance–Fourier transform infrared spectroscopy. The temperature has a significant influence on these PU surface structures. Surface characteristics such as wettability and surface free energy were also analyzed since the interaction between biomaterials and blood occurs at their interface. The preliminary cytotoxicity screening showed no cytotoxicity of these PU membranes. The PU samples do not accelerate the clot formation mechanisms under the tested conditions. The results suggest that these PU membranes are promising materials for the preparation of cardiovascular scaffolds.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584173
      Issue No: Vol. 27, No. 5 (2015)
       
  • Collagen immobilization on ultraviolet light-treated poly(ethylene
           terephthalate)
    • Authors: Drobota, M; Aflori, M, Gradinaru, L. M, Coroaba, A, Butnaru, M, Vlad, S, Vasilescu, D. S.
      Pages: 646 - 654
      Abstract: The present article is focused on the studies regarding the effects of ultraviolet (UV) light on poly(ethylene terephthalate) (PET) films surfaces using scanning electron microscopy (SEM), Fourier transform infrared, X-ray photoelectron spectrometry (XPS), and atomic force microscopy (AFM) measurements, subsequent to collagen immobilization. UV treatment influences the surface energy of polymers as the result of the polymer chain breaking, followed by insertion of oxygen-containing functional groups. Accordingly, after UV light treatment, collagen was adsorbed on the PET surfaces in different proportions. Significant changes in the surface topography appeared after collagen immobilization on UV-treated PET films, and they were put in evidence by SEM and tapping-mode AFM experiments. XPS measurements demonstrated the adsorption of collagen on PET UV light-altered surfaces by increasing of nitrogen content. The cytocompatibility tests using stem cells have shown good results for all treated polymers.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584177
      Issue No: Vol. 27, No. 5 (2015)
       
  • Bactericidal effect on Foley catheters obtained by plasma and silver
           nitrate treatments
    • Authors: Aflori, M; Miron, C, Dobromir, M, Drobota, M.
      Pages: 655 - 660
      Abstract: New medical, materials, and surgical procedures keep improving current health-care practices. Many of these innovations involve polymeric devices that must meet certain clinical and cost requirements. Novel antimicrobial technologies and nanotechnologies are being implemented in more applications such as implant interphases, coatings, and others to avoid postoperatory infections. Here we present a novel approach to create antimicrobial surfaces on Foley catheters widely used in hospitals in order to avoid a variety of harms including infection, pain, and trauma. The combination of plasma and silver nitrate wet treatments demonstrates to be a fast, easy, and convenient method for obtaining colonization-resistant catheter surfaces.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584171
      Issue No: Vol. 27, No. 5 (2015)
       
  • Synthesis and thermotropic properties of polyazomethines-containing side
           chain azobenzene moieties
    • Authors: Cozan, V; Iftime, M, Sava, I, Bronnikov, S.
      Pages: 661 - 668
      Abstract: Aromatic polyazomethines–containing azobenzene side groups have been synthesized by solution polycondensation reaction of aromatic dialdehydes bearing flexible spacers between the aromatic rings with aromatic diamines having preformed azobenzene side groups. Thermogravimetric analysis, differential scanning calorimetry, polarized optical microscopy, and wide angle X-ray diffraction have been used to evaluate their thermal and mesomorphic properties. The target polyazomethines showed nematic liquid crystalline phase, large mesophase range, and good thermal stability.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584179
      Issue No: Vol. 27, No. 5 (2015)
       
  • Crown ether-based structures for sensitive electrochemical detection
    • Authors: Simionca, I.-M; Arvinte, A, Pinteala, M.
      Pages: 669 - 675
      Abstract: N-(2-Hydroxypropyl)methacrylamide-co-N-acryloxysuccinimide with 2-aminomethyl-18-crown-6 (p(HPMA-NAS-18C6)) graft copolymer deposited on the gold (Au) electrode is able to bind heavy metal cations from aqueous solutions. The binding of the lead(II) cations (Pb2+) is monitored by quartz crystal microbalance, cyclic voltammetry, and anodic stripping voltammetry. Electrochemical studies have demonstrated that the presence of p(HPMA-NAS-18C8) on the Au electrode surface resulted in the shift of Pb oxidation wave to less negative potentials, accompanied by the increase of the oxidation peak magnitude. The p(HPMA-NAS-18C6)-modified electrode could sensitively detect Pb2+ cations in a range from 10 ppb to 4.39 ppm with a low detection limit of 0.17 ppb.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315584183
      Issue No: Vol. 27, No. 5 (2015)
       
  • Relaxation behavior of flax-reinforced ethylene-propylene-diene rubber
    • Authors: Cristea, M; Airinei, A, Ionita, D, Stelescu, M. D.
      Pages: 676 - 682
      Abstract: The molecular dynamics of flax-reinforced ethylene–propylene–diene monomer (EPDM) composites, with increasing quantities of flax (EPDM0–EPDM20), was investigated by dynamic mechanical analysis. Multifrequency experiments were also performed in order to distinguish between the relaxation and the kinetic events. Also the time–temperature superposition was applied to the multifrequency results for obtaining the master curves. They were used to anticipate the behavior of the composites in time and to calculate the activation energies using the Williams–Landel–Ferry equation.
      PubDate: 2015-07-06T02:05:15-07:00
      DOI: 10.1177/0954008315585610
      Issue No: Vol. 27, No. 5 (2015)
       
 
 
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