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  Subjects -> CHEMISTRY (Total: 831 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (584 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (26 journals)
    - INORGANIC CHEMISTRY (41 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (66 journals)

CHEMISTRY (584 journals)                  1 2 3 4 5 6 | Last

2D Materials     Hybrid Journal   (Followers: 5)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 31)
ACS Catalysis     Full-text available via subscription   (Followers: 27)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 16)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 17)
ACS Macro Letters     Full-text available via subscription   (Followers: 20)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 24)
ACS Nano     Full-text available via subscription   (Followers: 199)
ACS Photonics     Full-text available via subscription   (Followers: 5)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 12)
Acta Chemica Iasi     Open Access  
Acta Chimica Sinica     Full-text available via subscription  
Acta Chimica Slovaca     Open Access   (Followers: 5)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access   (Followers: 1)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 5)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 11)
Advanced Functional Materials     Hybrid Journal   (Followers: 41)
Advanced Science Focus     Free   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 24)
Advances in Chemical Science     Open Access   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 14)
Advances in Drug Research     Full-text available via subscription   (Followers: 17)
Advances in Enzyme Research     Open Access  
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 13)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 14)
Advances in Nanoparticles     Open Access   (Followers: 11)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Polymer Science     Hybrid Journal   (Followers: 37)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 10)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
African Journal of Chemical Education     Open Access   (Followers: 1)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 5)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 1)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 4)
AMB Express     Open Access  
Ambix     Hybrid Journal   (Followers: 2)
American Journal of Applied Sciences     Open Access   (Followers: 30)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 86)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 11)
American Journal of Chemistry     Open Access   (Followers: 20)
American Journal of Plant Physiology     Open Access   (Followers: 10)
American Mineralogist     Full-text available via subscription   (Followers: 8)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 20)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 136)
Annales UMCS, Chemia     Open Access   (Followers: 2)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 1)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 2)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 6)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 10)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 12)
Anti-Infective Agents     Hybrid Journal   (Followers: 1)
Antiviral Chemistry and Chemotherapy     Full-text available via subscription  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 4)
Applied Spectroscopy     Full-text available via subscription   (Followers: 16)
Applied Surface Science     Hybrid Journal   (Followers: 22)
Arabian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 4)
Autophagy     Full-text available via subscription   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 6)
Biochemistry     Full-text available via subscription   (Followers: 157)
Biochemistry Insights     Open Access   (Followers: 4)
Biochemistry Research International     Open Access   (Followers: 4)
BioChip Journal     Hybrid Journal   (Followers: 1)
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Bioinspired Materials     Open Access  
Biointerface Research in Applied Chemistry     Open Access   (Followers: 1)
Biointerphases     Open Access  
Biomacromolecules     Full-text available via subscription   (Followers: 18)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 6)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 2)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 30)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 23)
Bioorganic Chemistry     Hybrid Journal   (Followers: 5)
Biopolymers     Hybrid Journal   (Followers: 16)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 13)
C - Journal of Carbon Research     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 3)
Canadian Journal of Chemistry     Full-text available via subscription   (Followers: 6)
Canadian Mineralogist     Full-text available via subscription   (Followers: 2)
Carbohydrate Research     Hybrid Journal   (Followers: 11)
Carbon     Hybrid Journal   (Followers: 75)
Catalysis for Sustainable Energy     Open Access   (Followers: 3)

        1 2 3 4 5 6 | Last

Journal Cover   Chemistry and Materials Research
  [10 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2224-3224 - ISSN (Online) 2225-0956
   Published by International Institute for Science, Technology and Education (IISTE) Homepage  [30 journals]
  • Synthesis Of Fe3O4 Nanoparticles Of Iron Sand Coprecipitation Method With
           Polyethylene Glycol 6000

    • Authors: Nurdin Bukit, Erna Frida, Pintor Simamora, Tresia Sinaga
      Abstract: This study aimed to obtain a particle size-based nano Fe3O4 iron sand, determine the effect of Polyethylene Glycol (PEG) -6000 to be produced from iron sand in synthetic by using coprecipitation method and the nature of magnetization. Synthetic done by mixing natural sand with HCl as solvent and NH4OH as a precipitant, as templates are added PEG-6000 .. Then, characterized by using X-Ray Diffractometer (XRD). Vibrating Sample Magnetometer (VSM) and Fourier Transform Infra Red (FTIR). From the test results (XRD) shows the crystal size Preparation Fe3O4 nanoparticles with PEG 6000 (1: 3), (1: 4), (1: 5) in a sequence that is 14.90 nm, 22:16 nm, 33.11 nm while without PEG 6000 29.08 nm , Vibrating Sample Magnetometer measurement results (VSM) shows that the value of Ms saturation field for without PEG-6000 Fe3O4, Fe3O4 with PEG-6000 (1: 3), (1: 4), (1: 5) respectively 27.9 emu / g, 47.4 emu / g, 35.3 emu / g, 51.7 emu / g and field coercivity (Hc), each for 0,013 Tesla, 0.022 Tesla, Tesla 0.14, 0.009 Tesla. FTIR results showed that there was a shift peaks indicating increased number of PEG. From each sample came the peak of Fe-O owned by Fe3O4 where the wavelength of Fe-O at sample PEG has a lower value than the wavelength Fe3O4 caused the PEG Key words: Nanoparticles Fe3O4, PEG 600, particle size, magnetic properties  
      Issue No: Vol. 7
       
  • SYNTHESIS OF 4-BENZYLIDENE-2-(4-NITRO- PHENYL) - 4H-OXAZOL-5 -ONE
           DERIVATIVES WITH SUSPECTED BIOLOGICAL ACTIVITY

    • Authors: Kawkab Y. Saour, Redha I. Hussain Al-Bayati, Jaafar Sataar Shia
      Abstract: Oxazolones are five membered heterocyclic compounds containing nitrogen and oxygen as heteroatoms.The C-2 and C-4 positions of the oxazolone are crucial for their various biological activities. A series of oxazolone derivatives (1-11) have been synthesized as potential antibacterial and fungal agent. The newly synthesized compounds were evaluated. compounds have been prepared by the condensation of 4-nitrobenzoylglycine or benzoyl glycine  with aromatic aldehydes in the presence of ethanol, acetic anhydride and glacial acetic acid. The newly synthesized compounds were characterized by FTIR, ¹HNMR, C¹³NMR. Keywords:- Oxazolone, antibacterial and fungal agent, Synthesis.
      Issue No: Vol. 7
       
  • The Role of Nano Particles Additives on The Wear Properties of Al-Pb alloy

    • Authors: Hayder Ali Hussein, Adnan N. Abood
      Abstract: The Al-Pb alloy is one of the important alloys, especially for bearings materials. The main problem of Al-Pb alloy is the difference in melting point and immiscibility between aluminum and lead. In this research mechanical alloying method was used to produce Al- 10%Pb- 4.5%Cu by mixing the constituent in a ball mill under argon atmosphere for two hours at 150 rpm , then it was pressed with different applied loads (44100, 49000, 53900, 58800 and 63700N) and at three sintering temperatures (350, 450 and 550℃). The results show that sintering temperature was  the main factor affecting on the microstructure of alloy. The grain size was reduced with increasing sintering temperature and applied load. The results revealed that the best hardness and compressive strength was obtained with 58800N applied load and 450℃ sintering temperature due to the formation of CuAl2 as well as good distribution of Pb. Alumina in a form of micro and nano particles size resulted in a decline in hardness and wear resistance, while micro Al2O3 improved compressive strength and then decreased at high concentration (2wt. %). The addition of micro and nano SiC resulted in  reduced hardness. Micro SiC improves wear resistance and slightly improved the compressive strength while nano SiC increased to some extent the compression strength and reduced wear resistance. The grains size decreased with the increase of the percentage of Al2O3 and SiC (micro and nano) until 1.5% Al2O3 and 1%SiC addition. X-ray diffraction indicated the formation of new Al-Cu intermetallic compound (Cu9Al4) in the alloy containing Al2O3 or SiC associated with disappears of CuAl2. Keywords: Mechanical alloying, Sintering, SEM, EDS, hardness, compressive strength, Wear.  
      Issue No: Vol. 7
       
  • Physicochemical Studies and Biological Activity of Mixed Ligand Complexes
           Involving Bivalent Transition Metals,
           2-Aminomethylthiophenyl-4-Bromosalicylaldehyde Schiff Base and Glycine

    • Authors: A.A. El-Sherif, Mutlaq S. Aljahdali, Abeer T. AbedelKarim, Mahmoud M. Ahmed
      Abstract: The Mixed-ligand complexes of Co(II), Ni(II), Mn(II) and Zn(II) with 2-aminomethylthiophenyl-4-bromosalicylaldehyde Schiff base (ATS) and glycine as a representative example of amino acids have been achieved. These complexes namely [Ni(ATS)(Gly)] (1), [Co(ATS)(Gly)].H2O (3) [Mn(ATS)(Gly)].2H2O (2)  and [Zn(ATS)(Gly)] (4) were characterized by elemental, molar conductance, infrared, magnetic moment, and electronic spectra. ATS behaves as mononegatively charged bidentate ligand with coordination through azomethine nitrogen and phenolate oxygen groups while glycine acts as monobasic bidentate ligand is coordinated via amino and ionized carboxylate group after deprotonation. The low molar conductance values suggest the non-electrolytic nature of these complexes. The magnetic and spectral data indicates a square planar geometry for Ni2+ complex, tetrahedral geometry for Zn2+ and octahedral geometry for both Mn2+ and Co2+ complexes. The isolated chelates have been screened for their antimicrobial activity. Keywords: Schiff base, Nickel(II); Glycine; Electronic Spectra; antibacterial activity.
      Issue No: Vol. 7
       
  • Experimental and Quantum Chemical Studies on the Corrosion Inhibition
           Potentials of Xylopia aethiopica extracts

    • Authors: Nkechi Emea Ibisi, Nnaemeka Joshua Nnochiri Nnaji, Christopher Uchechukwu Sonde
      Abstract: Root and root bark extracts of Xylopia aethiopica (XE) have been evaluated as corrosion inhibitors for mild steel in aerated 0.1 M HCl and H2SO4 solutions by gravimetric method. The inhibition efficiency increases with increase in inhibitor concentrations. Adsorption mechanisms for the adsorptions of XE extracts’ molecules were predicted using the following adsorption isotherms (Langmuir, Freundlich, Temkin and El-Awady) by linear regression. With the aid of Chi-square (X2) statistic, the best fitted adsorption isotherms were selected. Physisorption mechanisms have been proposed for the extracts in the studied acidic media.  Quantum chemical calculations gave some electronic properties of the molecules of XE extracts so as to ascertain any correlation(s) between the corrosion inhibition and molecular structures. Keywords: Quantum Chemical calculation, Xylopia aethiopica, corrosion inhibition
      Issue No: Vol. 7
       
  • Salivary Interleukin 6 is A Valid Biomarker for Diagnosis of Osteoporosis
           in Postmenopausal Women

    • Authors: Widad Farhan Jabber, Taghreed F. Zaidan, Faiq I. Gorial, Ahmed S. Al-Naaimi
      Abstract: Background: Interleukin 6 (IL6) is pro-inflammatory cytokine associated with decline in ovarian function during menopause which is involved in the pathophysiology of postmenopausal bone loss. Objective: To investigate validity of salivary IL6 as a biomarker to diagnose osteoporosis in post-menopausal women. Patients and Methods: This cross sectional study was conducted on 75 postmenopausal women. Bone mineral density (BMD) was measured by dual energy x-ray absorptiometry (DXA) to diagnose osteoporosis. Salivary IL6 was measured for all postmenopausal women by using Human ELISA kit. Results: Of a total 75 individual involved in the study, 25 were healthy postmenopausal women, 25 had osteopenia, and 25 had osteoporosis. There was no statistical significant differences between age and body mass index in all groups (p>0.05). Mean level of salivary IL6 was significantly different among healthy controls, osteopenic group, and osteoporotic group (11.66 ± 4.44 vs 14.51 ± 6.5 vs 23.9 ±5.52 pg/ml; p<0.001) respectively. The mean salivary IL-6 was significantly higher in osteoporosis group (23.9 pg/ml) compared to control group (11.66 pg/ml). Salivary IL-6 was a valid parameter to predict osteoporosis in postmenopausal woman (ROC area=0.91, p<0.001).Salivary IL-6 showed positive strong significant linear correlation with bone t- score (r=0.62,     P<0.001). Salivary IL6 at the optimum cut off value ≥19.45 pg/ml has highest accuracy (81.3%) to diagnose osteoporosis in postmenopausal women  with sensitivity was 84.%, specificity 80 %, positive predictive value (PPV) at pretest probability 50% was 80.8%,  and PPV at pretest probability 90% was 97.4 %,  and  negative predictive value (NPV) at pretest  probability 10% was 97.8 %. Conclusions: Salivary IL6 was a simple, easy, and a valid biomarker to diagnose osteoporosis in postmenopausal women with high accuracy. This may indicate a hopeful measure for early diagnosis and treatment of osteoporosis. Keywords: Salivary IL6, Menopause, Proinflammatory cytokines, Osteoporosis.
      Issue No: Vol. 7
       
  • Review on Removal of aflatoxin from maize by using plant extract

    • Authors: Tesfahun Bufebo
      Abstract: This review summarizes the historical development of aflatoxin problems in maize and the attendant responses in the agricultural research community. Originally, studies were focused on the stored commodity, since the two toxin-producing species, Aspergillus flavus and A. parasiticus, were considered storage fungi. Laboratory investigations identified major factors influencing development of the toxin-producing species in storage, such as moisture, temperature, aeration and substrate. Various modifications of key components of the storage environment were developed to control the fungi. The discovery of preharvest infection of developing maize kernels by A. flavus or A. parasiticus and subsequent production of aflatoxin introduced a new facet of mycotoxicology. The same environmental factors that influence fungi in storage appear to affect the processes of field infection contamination to varying degrees. However, in the developing maize ecosystems, agricultural activities dramatically influence interacting species, including host plants, attendant microbes, arthropods and other pests.  The prevention of fungal growth is still the best practice to prevent contamination by aflatoxins in foods and feeds, other measures are also necessary. Keywords: aflatoxigenic, Aspergillus flavus, maize, fungal and Aspergillus parasiticus
      Issue No: Vol. 7
       
  • Removal of Ni(II) and Cd(II) from Their Aqueous by Bio Byproducts of Leaf
           Base (Petiole) and Fiber of the Date Palm as Low Cost Adsorbents

    • Authors: Mohammed T. Khathi
      Abstract: The present study included study of using the agricultural bio byproducts of leaf base (petiole) and fiber of the date palm as low cost adsorbents for removal of Ni(II) and Cd(II) from their aqueous solutions via preparation of activated carbon. The results showed that the adsorption equilibrium time was 40, 30 min. for Ni(II) by leaf and fiber respectively and 30 min for Cd (II) adsorption by both of byproducts. The obtained results indicated that over pH range (6.5–7.0) there is an increased optimum of adsorption for all metal ions. (0.5g) of adsorbent is very ideal to obtain the best adsorption for both studied metals ions . The capacity of the adsorbents to adsorb these metal ions were found to be Ni (II) >Cd (II). The isotherms obeyed Langmuir isotherm better than Freundlich isotherm for both metals. Fiber has the highest removal than petiole. Thermodynamic parameters ( ΔGo) , (ΔHo) and (ΔSo) have been found that the sorption process was feasible, spontaneous and exothermic. Calculated kinetic parameters showed that the pseudo first order model is best fit to the experimental data.
      Issue No: Vol. 7
       
  • Biosorption of Selected Heavy Metals by Green Algae, Spirogyra Species and
           Its Potential as a Pollution Biomonitor

    • Authors: G.M. Matei, J.K. Kiptoo, N. Oyaro, A. O. Onditi
      Abstract: In this paper, adsorption features of freshwater green algae as a function of contact time, initial pH and initial metal ion concentrations were studied using model solutions of metal ions with subsequent determination by flame atomic absorption spectrometry (FAAS). Green algae samples were employed as bioindicators of selected heavy metals in environmental water samples with determination using FAAS and ICP-OES (inductively-coupled plasma-optical emission spectrometry). The optimum pH for cadmium (Cd), chromium (Cr), copper (Cu) and lead (Pb) biosorption were found to be 5.5, 5.8, 5.9 and 5.0, respectively. The biosorption process follows second order kinetics and is well described by the Langmuir isotherm model. Adsorption capacities were found to be 22.52, 38.19, 35.59 and 94.34 mg/g for Cd, Cr, Cu and Pb, respectively, at contact times of 15-50 minutes and initial metal ion concentrations of 500-700 mg/L. Biomonitoring studies revealed great potential for freshwater green algae as a bioindicator with mean concentration factors in the range of 367-7154 for the selected elements, the uptake being mainly via a metabolically mediated pathway. This work has demonstrated the potential of freshwater green algae as both a biosorbent and a bioindicator for heavy metal pollution in water systems. Keywords: Green algae, Biosorption, Biomonitoring, Toxic metals, FTIR, ICP-OES.
      Issue No: Vol. 7
       
  • Journal Coverpage

    • Authors: Journal Editor
      Abstract: .
      Issue No: Vol. 7
       
  • Utilization of PVC Particles to Improve the Bending Properties of Epoxy
           and Unsaturated Polyester

    • Authors: Sana S. Hameed, Besma M. Fahad
      Abstract: Two sets of polymeric composites were formed. The first set included epoxy as matrix ,while the second set included unsaturated polyester (UP) as matrix. The two sets were reinforced with Polyvinyl Chloride (PVC) at  different volume fractions. Each set was formed into two groups: one was allowed to cure at room temperature and the other was post cured at 40°C for 4hr . The percent of reinforcing and the curing temperature can affect the  behavior of composites. The epoxy composites is the highest in flexural properties than unsaturated polyester composites after reinforcing with thermoplastic material (PVC) . Keywords: epoxy, unsaturated polyester, polyvinyl chloride (PVC), bending.  
      Issue No: Vol. 7
       
  • Corrosion Control of Mg-Zn Implant Alloys in Simulated Body Fluid

    • Authors: I. M. Ghayad, M. A. Maamoun, W. A. Metwally, A.N.Abd El-Azim, Z.M. El-Baradie
      Abstract: Magnesium alloys have recently attracted the attention as a new biodegradable material.  In this study, Mg-Zn alloys (1-4wt.% Zn) were fabricated with high purity raw materials using a clean melting process (fluxless method) and a protective atmosphere of CO2 + 0.4 SF6. The as-cast microstructures of the investigated alloys were characterized by optical and scanning electron microscopes, EDS and XRD. Corrosion properties of the prepared alloys were examined in simulated body fluid (SBF) by electrochemical techniques and immersion test (hydrogen evolution method).  Surface modification of the prepared alloys was performed using micro arc oxidation (MAO) treatment and hydroxiapatite (HA) coating. The results of the as-cast microstructure showed that Zn up to 2 wt% was completely dissolved in a-Mg matrix. On increasing Zn content (> 2wt%) the grain size decreased and a second MgZn2 phase was observed. Corrosion testing results revealed that Mg-1,2,3 wt% Zn have almost the same corrosion rates (0.025 mm/y) whereas Mg-4Zn has the highest degradation rate. Hydroxiapatite (HA) coating on micro-arc oxidation (MAO) treated magnesium alloys formed a dense and compact layer on the surface of magnesium alloys which had greatly improved surface properties and enhanced corrosion resistance of the prepared alloys. Keywords: Mg alloys, implants, biodegradable, corrosion, surface modification
      Issue No: Vol. 7
       
  • Formulation of Emulsion Paint from a Copolymer Composite of Dimethylol
           Urea/Polystyrene

    • Authors: A. Akinterinwa, S. A. Osemeahon, I.I. Nkafamiya, P.M. Dass
      Abstract: Dimethylol urea (DMU) with reduced formaldehyde emission was synthesized in this work and copolymerized by blending with polystyrene (PS) obtained by constituting waste expanded polystyrene into liquid form. The determined physical properties of the copolymer composite (i.e. DMU/PS) compared to the pure DMU revealed improvements in its disadvantageous properties such as hardness and moisture uptake. Paint samples were formulated using the pure DMU, DMU/PS and commercially obtained acrylic PVA binder resin, and analyzed. While the DMU/PS and APVA paints passed, the pure DMU failed such critical coating tests as flexibility, adhesion and blistering. Again, the DMU/PS and PVA paints show good chemical resistance while the DMU paint blisters in the alkaline medium. However, all paint samples passed tackiness, opacity and stability, and exhibit acceptable pH, viscosity, and drying time. Keywords: Dimethylol urea, Polystyrenes, Copolymer composite, Emulsion paint
      Issue No: Vol. 7
       
  • Fabrication, Characterization and Deformation Behavior of a New Acrylate
           Copolymer-based Nonwoven Structure

    • Authors: David N Githinji, John T Githaiga, David R Tuigong, Diana S Madara, Bernard Kipsang, Silas Khasindu
      Abstract: A method of fabricating nonwoven structure from dry-laid cotton fibers and atomized acrylate copolymer is presented. The method based on a consolidation pressure of about 2kPa and room temperature curing, is used to produce structures with fiber mass to binder volume ratio (FBR) of 0.7, 0.5, 1, 1.5, 2 and 3. Structurally stable structures are produced and characterized in terms of their bursting strength, areal density, water absorption, and monotonic deformation behavior. At constant FBR, the bursting strength and areal density of the structures increases with the fiber mass. The structures’ water absorption capacity reduces with the increase in the volume of binder applied. At FBR of 1 and area density of 295 grams per square meter, the structure’s load-strain curve is characterized by a linear and non-linear behavior corresponding to elastic and inelastic strain, respectively. At peak loads, the structure’s deformation is relatively uniform but becomes localized as the failure point is approached. A good correspondence is established between the strain assessment based on uniaxial tensile test and on image correlation using Particle Image Velocimetry (PIV) method. The average vector magnitude derived from PIV measurement, correlate well with the engineering strain and can thus be used for strain estimation. Keywords: Nonwoven, Dry-laid, Deformation, Particle Image Velocimetry, acrylate copolymer
      Issue No: Vol. 7
       
 
 
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