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A. MANDAL, S. P. SINGH, R.PRASAD
Journal of Polymer Materials, Vol.35, No.1, pp. 1-13, 2018
Abstract Molecular dynamics simulations of stress relaxation and dynamic loading of isotactic polypropylene have been studied using full atomistic model. Curves of relaxation, used to evaluate the relaxation parameters, show agreement with experimental results. The relaxation time is calculated from the simulated stress relaxation curve. The dynamic loading curves show that stress leads strain as proposed by other theoretical models. Storage modulus, loss modulus and loss factor have been calculated. Despite limitations of smaller simulation time, the results are in comparable range with the experimental values. The length scale limitation of MD simulation is taken care More >

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DIBYENDU S. BAG^*, KM. MEENU, AKANSHA DIXIT, N. ESWARA PRASAD
Journal of Polymer Materials, Vol.35, No.1, pp. 15-32, 2018
Abstract (R)-N-(1-phenyl-ethyl) methacrylamide (R-NPEMAM) was synthesized which is an organic chiral monomer. The crystals of such monomer were obtained by recrystallization of the synthesized product from ethanol-water mixture. It was polymerized with 2-hydroxyethyl methacrylate (HEMA) and a crosslinking monomer, N,N ’ methylene bisacrylamide in toluene medium. These materials have been characterized by different analytical techniques such as FTIR, elemental and SEM analyses for their structural and morphological investigation. The organic monomer is a chiral molecule and its optical rotation was observed to be: [α]_D²⁵=28o (C 1.0 DMF). On the other hand, optical rotations were observed to be:… More >

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JIANGBO WANG^*
Journal of Polymer Materials, Vol.35, No.1, pp. 33-44, 2018
Abstract In the present study, a novel polysilicone PMDA was synthesized and the effect of PMDA on the flame retardancy of epoxy resin (EP) was investigated by cone calorimeter measurement. EP/PMDA (FREP) composite exhibited lower peak heat release rate (PHRR) and total heat release (THR) in comparison with those of pure EP, indicating the higher fire safety of FREP. Furthermore, the thermal degradation behavior of FREP composite was investigated by the TGA measurement under non-isothermal conditions. The Kissinger and Flynn-Wall-Ozawa methods were both used to analyze the thermal degradation process of EP composites. The results illustrated More >

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GUIQIN LI^1,A,*, JUN WANG¹, JIEMIN FENG¹, QING GUO², JUNLONG ZHOU², PETER MITROUCHEV^3,B,*
Journal of Polymer Materials, Vol.35, No.1, pp. 45-57, 2018
Abstract The mechanical behaviors of five modified polypropylene composites were investigated under the effect of various temperatures. Mechanical properties of polymer were carried out through uniaxial tensile tests for low and high temperatures respectively. The results showed that both yield stress and the elastic modulus of the material decrease with the increase of temperature. The properties are also significantly influenced by the addition and the additive quantity. The addition with glass fiber (GF) manifests higher properties than the other addition, and the modulus and yield stress increase with the increasing of the additive amount. Three models More >

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A. SURESH BABU^a, T.T. NAGARAJAN^a,b,*, K. PALANIVELU^b, S.K. NAYAK^b
Journal of Polymer Materials, Vol.35, No.1, pp. 59-69, 2018
Abstract The mechanical and thermal properties of hybrid epoxy composites reinforced with carbon fiber (CF) and pineapple leaf fiber (PALF) composites depend upon fiber-matrix interfacial properties. A comparison between the CF composite and hybrid fiber composite was made. Composites were characterized by tensile, flexural and impact, TGA, DMA, and SEM analysis. The results showed that the tensile and flexural strengths are increased with increasing CF content upto 30 wt % in the hybrid composite. CF/PALF fibre can be used for improving the properties of hybrid epoxy composites. More >

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NA TENG, JINYUE DAI^#, YONG WEN, JING CHEN^*, FEI LIU, JIN ZHU, HAINING NA^*
Journal of Polymer Materials, Vol.35, No.1, pp. 71-83, 2018
Abstract This study focuses on the microwave-assisted synthesis of hydroxyl-terminated polybutadiene (HTPB) based polyurethanes. Driven by microwave irradiation, the synthetic rate of HTPB based polyurethanes is three times faster than the synthesis operated by traditional oil-bath heating. Though the synthesis time is significantly decreased, polyurethanes synthesized with microwave irradiation exhibit comparable mechanical performances to the similar polyurethanes obtained by traditional oil-bath heating. The tensile strength and Young’s modulus of polyurethanes synthesized with microwave irradiation are also higher than conventional method. HTPB based polyurethanes also exhibit excellent thermal stability and hydrolysis resistance. Our research suggests a fast More >

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PRABHA BHARTIYA, P.K. DUTTA^*
Journal of Polymer Materials, Vol.35, No.1, pp. 85-101, 2018
Abstract Designing theranostic agents that are responsive to mildly acidic and reducing tumor microenvironments for optimized imaging and chemotherapeutic effects, is of huge interest in nanomedicine. In this context, we have prepared mesoporous manganese silicate NPs and a biocompatible coating of carboxymethyl chitosan (CMC) was introduced on the surface of manganese silicate nanoparticles. In order to confer multifunctionality to the prepared nanovehicle, it was treated hydrothermally which resulted in formation of fluorescent C-dots on the surface of nanovehicle. The nanoarchitecture CD@CMC@MnSiO₃ was characterized by FTIR, XRD, UV-visible and PL spectroscopy. A hydrophobic drug curcumin was loaded on More >

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RABIRANJAN MURMU^1,2,*, HAREKRUSHNA SUTAR¹
Journal of Polymer Materials, Vol.35, No.1, pp. 103-118, 2018
Abstract Sulfonated Polyether Ether Ketone (SPEEK) membrane is considered as a potential alternative membrane for fuel cell because of its cost effectiveness and easily prepared. SPEEK membranes were prepared by solution casting method with film thickness of 80, 127 and 150 µm. Samples are analyzed by Fourier Transform Infrared (FTIR) Spectrometer. Water uptake study states that diffusivity of water increased with increase in Degree of Sulfonation (DS) of the membrane. Experimental moisture uptake data was fitted to a dual stage model. Proton conductivity of the membrane was measured by two probe method using impedance analyzer. Proton… More >

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DUXIN LI^*, YUE CHEN, WENYAN YANG, CHUNGUANG XIAO, MENGLIN WEI
Journal of Polymer Materials, Vol.35, No.1, pp. 119-136, 2018
Abstract To elucidate the effect and the mechanism of graphene modification on the morphology and properties of polyimide (PI), cyclohexyl isocyanate modified graphene (CG), was designed and prepared by grafting the isocyanate chain on the graphene sheet surface, followed by the use of the modified graphene for the preparation of polyimide composites by in situ polymerization. The successful grafting of cyclohexyl isocyanate onto the surface of the graphene was confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and Raman spectroscopy. The unique surface modification significantly improved the compatibility and dispersion of graphene in the PI matrix.… More >

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NIDHI NIGAM, SANTOSH KUMAR^#, P.K.DUTTA^*, TAMAL GHOSH^*
Journal of Polymer Materials, Vol.35, No.1, pp. 137-148, 2018
Abstract The present investigation deals with the anion sensing studies of prepared chitosan/methyl red dye: chitosan/hydroxy nitro azobenzaldehyde (CHNAB) and chitosan/hydroxy methyl azobenzaldehyde (CHMAB) derivatives under mild conditions. These derivatives were synthesized by 79% and ≥ 90% deacetylated chitosan, in isopropyl alcohol/water mixture and dimethyl sulfoxide. The polymers were well characterized by thermal analysis (differential scanning calorimetry, DSC and thermogravimetric analysis,TGA), FTIR, ¹H-NMR, ESI-Mass spectra, birefringence and antibacterial activity and reported elsewhere. The optical property of the derivatives is an advantageous property prompted us to evaluate its anion sensing properties by UV-titrimetric method. UV–visible titration was carried More >

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