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Anil Kumar Bajpai,Anjana Goswami,Jaya Bajpai,Benoy Kumar Sinha 한국고분자학회 2018 Macromolecular Research Vol.26 No.4
Thin films of calcium alginate (CaAlg)/poly(vinyl alcohol) (PVA) and CaAlg/PVA-vanadium pentoxide (V2O5) bionanocomposites were synthesized by solution casting approach followed by impregnation of vanadium pentoxide and investigated for their structural, mechanical, optical, and electrical properties for possible use as cathode material in Li-ion batteries. The interaction of V2O5 nanoparticles with CaAlg/PVA film was investigated using Fourier transform infrared (FTIR) spectroscopy which suggested for strong interactions between V2O5 nanoparticles and CaAlg/PVA matrix film thus confirming successful impregnation of V2O5 into the matrix film. Crystalline nature of prepared samples was probed by X-ray diffraction (XRD) technique that indicated improvements in crystalline nature of the material. For evaluation of particle size and morphology, transmission electron microscopy (TEM) was also used. The roughness of the surfaces of bionanocomposite films was also determined by the atomic force microscopy (AFM) which showed an increase in morphological parameters upon impregnation of vanadium pentoxide nanoparticles into the polymer matrix. The thermal properties like glass transition temperature, crystalline point and crystalline melting point were determined by differential scanning calorimetry (DSC) technique. The results of tensile strength and microhardness measurements depicted that the prepared bionanocomposite films possessed good mechanical strength than the native polymer matrix. Significant enhancement in electrical conductivities was observed upon insertion of V2O5 into the native blend film.
Shukla, Sandeep,Bajpai, Anil Kumar,Bajpai, Jaya The Polymer Society of Korea 2003 Macromolecular Research Vol.11 No.4
A hydrophilic macromolecular network containing hydrophobic moieties has been prepared by free radical copolymerization of acrylamide and styrene in the presence of poly(vinyl alcohol) (PVA) and its potential as controlled drug delivery carrier was evaluated with tetracycline as a model antibiotic drug. The amount of drug was assayed spectrophotometrically. The network was characterized by optical microscopy, infra-red spectroscopy and structural parameters such as average molecular weight between cross1inks ($M_c$), cross1ink density (q) and number of elastically effective chains ($V_e$) were evaluated. It was found that with increasing concentration of PVA, ST and MBA in the hydrogel, the release rate initially increases but after definite concentrations of the above components the release rate falls. In the case of AM, release rate constantly decreases with increasing AM concentration in the hydrogel.