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NALINI SHARMA^1,*, AJAY SINGH², RAJ KUMAR DUTTA³
Journal of Polymer Materials, Vol.37, No.1-2, pp. 1-15, 2020, DOI:10.32381/JPM.2020.37.1-2.1
Abstract Controlled Release fertilizers (CRFs) are new generation agrochemicals which aid in decreasing environmental pollution. In the present study, novel CRF beads are synthesized by the technique of sol-gel polymerization. CMC polymer at various concentrations was used as a matrix and kaolin was used as a binder to enhance mechanical properties of the beads. The study also reveals the incorporation of Kaolin at different concentrations and optimization of the same. Fe3+ was used as a cross-linker to obtain spherical beads. Also, a study was done to optimize the cross linking time and concentration of cross linking solution. The usage of polymers… More >

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BAOHAI PAN^1,2, JUNCHENG HUANG¹, LAI CHEN², FEI LIU^1,*, CHEN JING, HAINING NA^1,*, JIN ZHU¹
Journal of Polymer Materials, Vol.37, No.1-2, pp. 17-27, 2020, DOI:10.32381/JPM.2020.37.1-2.2
Abstract A switchable CO₂ /1,8-diazabicyclo[5.4.0]undec-7-ene (DBU)/dimethyl sulfoxide (DMSO) solvent system is applied to prepare corn cellulose film with controllable mechanical property. By use of the switchable CO₂ /DBU/DMSO system, a rather simple process concerning reacted dissolution and heated precipitation controlled by addition and releasing of CO₂ respectively, to prepare corn cellulose film, is formed. Results exhibit the degree of dissolution of corn cellulose is easily controlled just by adjusting the feeding amount of DBU in the switchable solvent system. Accordingly, some undissolved part of corn cellulose with relative high crystallinity can be appropriately retained to contribute to the improvement of mechanical… More >

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ZHAO JUN^a, LIU AIQIN^a, ZHOU HONG^a, LUO JUN^b,*, AND LIU YUAN^b,*
Journal of Polymer Materials, Vol.37, No.1-2, pp. 29-42, 2020, DOI:10.32381/JPM.2020.37.1-2.3
Abstract Heteroatoms (N, O, and F) and hydrogen groups are important elements for forming the H-bonds. It is well known that a large number of hydrogen groups are formed after curing reaction of epoxy. However, literatures about epoxy resins containing heteroaromatic ring and the H-bonds after cure reaction of the epoxy resins are seldom published. To bridge the gap, a kind of new epoxy monomer containing pyridine ring (EMP) has been synthesized in this work, andit is further cured by 4,4-diaminodiphenyl methane (DDM). The properties of cured EMP/ DDM are evaluated by DSC, DMA, and static contact angle measurement. Moreover, the… More >

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R. SARAVANAN^*, A. SURESHBABU
Journal of Polymer Materials, Vol.37, No.1-2, pp. 43-54, 2020, DOI:10.32381/JPM.2020.37.1-2.4
Abstract In this research work, multi walled carbon nanotubes (MWCNT) particulate filler of various (0.9, 1.2, 1.5, & 1.8 wt %) weight percentage was used along with epoxy resin. A novel method of distributing the MWCNT in epoxy had been employed to reduce the agglomeration problem by charging the MWCNT electrostatically. The electrostatic charged (MWCNT) and uncharged (MWCNT) were loaded on to matrix and then it was stirred by a mechanical mixer for 300 minutes continuously to achieve uniform distribution. The nano filler reinforced composite was fabricated by using hand layup method and mechanical testing (Tensile and Flexural) were performed as… More >

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FATMA LOUZRI, SADJIA BENNOUR
Journal of Polymer Materials, Vol.37, No.1-2, pp. 55-76, 2020, DOI:10.32381/JPM.2020.37.1-2.5
Abstract Poly(N,N-dimethymethylacrylamide -co-crotonic acid) (P(DMA-CAx)) hydrogels were prepared by free radical polymerization, using N,N- methylenebisacrylamide (NMBA) as cross-linking agent. The synthesized hydrogels were characterized by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). The effects of comonomer composition and pH of the medium on the swelling behavior of hydrogels were investigated. The obtained results showed that the swelling capabilities of hydrogels increased as crotonic acid content and pH increased. In order to evaluate the controlled release potential of the polymeric matrix, it was loaded with potassium nitrate and ammonium nitrate as fertilizers and the release kinetics was studied as a… More >

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YAN WANG^A, LI-FANG ZHANG^A,B,C,*, XIAO-QI WANG^B
Journal of Polymer Materials, Vol.37, No.1-2, pp. 77-89, 2020, DOI:10.32381/JPM.2020.37.1-2.6
Abstract The effect of 18-crown-6 ether (18C6) on the anionic polymerization of ε-caprolactone (ε -CL) using potassium tert-butoxide (t-BuOK) as the initiator was studied. The experimental results showed that 18C6 in combination with t-BuOK exhibited high selectivity for ring opening relative to trans-esterification and improved control toward the ROP of ε-CL, producing poly(ε- caprolactone) (PCL) with much higher molecular weight and relatively narrow distribution compared to those using t-BuOK alone as the initiator.The influences of reaction conditions, such as monomer concentration, monomer/initiator molar ratio, and [18C6]/[t-BuOK] molar ratio, as well as reaction temperature and time on the polymerization have been examined… More >

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D. MURALI MANOHAR^1,*, B.C. CHAKRABORTY², S. SHAMSHATH BEGUM³
Journal of Polymer Materials, Vol.37, No.1-2, pp. 91-107, 2020, DOI:10.32381/JPM.2020.37.1-2.7
Abstract In search of improved materials for efficient shock and vibration mounts for machineries, graphite loaded NBR and NBR/PVC blend were made and investigated. The scorch time was seen to be reduced and vulcanization rate was enhanced due to graphite inclusion. Scanning electron microscopy images have shown homogenous dispersion of graphite powder. NBRgraphite showed a gradual increase in the hardness, tensile strength, Young’s modulus, and tear values with increasing graphite loading. In the case of NBR/PVC-graphite composition, a drop in the tensile strength and increase in the Young’ modulus and tear strength was observed. Various mathematical models were used to investigate… More >

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A.K. GHOSH¹, RUTUJA S. BHOJE², R.C. BINDAL¹
Journal of Polymer Materials, Vol.37, No.1-2, pp. 109-120, 2020, DOI:10.32381/JPM.2020.37.1-2.8
Abstract In this study, cellulose triacetate (CTA) based nanocomposite membranes were developed by incorporation of carboxylic acid functionalized multiwalled carbon-nanotube (cMWCNT) and graphene oxide (GO) which have enhancement of both flux and fouling resistance properties of the membranes. Membranes were casted at room temperature and annealed at 90o C hot water for 10 minutes. The incorporation level of both the nanomaterials is 1.5% of the CTA polymer weight in the nanocomposite membranes. Prepared membranes were characterized in terms of water contact angle, surface morphology and mechanical strength. The performance of the membranes was evaluated both in reverse osmosis (RO) and forward… More >

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