Home / Journals / JPM / Vol.35, No.4, 2018
  • Open AccessOpen Access

    ARTICLE

    Synthesis, Characterization, and Micellization Behavior of Poly(L-lactide) and Poly(ethylene glycol) Block Copolymers in the presence of a Novel Organocatalyst

    YAN WANGa, JIN-HUA WANGa, JUN-HUA BAIa, LI-FANG ZHANGa,b,*
    Journal of Polymer Materials, Vol.35, No.4, pp. 393-408, 2018, DOI:10.32381/JPM.2018.35.04.1
    Abstract Biodegradable poly(L-lactide)-poly(ethyleneglycol)-poly(L-lactide) (PLLA-b-PEG-b-PLLA) triblock copolymers and 4-arm star-shaped poly(ethylene glycol)-poly(L-lactide) (4-arm star-shaped PEGb-PLLA) block copolymers were synthesized via ring-opening polymerization of L-lactide (LLA) in the presence of hydroxyl-terminated α, ω-dihydroxy PEG2000 (PEG2000) and 4-arm PEG as a macroinitiator and 2, 3, 6, 7-tetrahydro-5H-thiazolo [3, 2-a] pyrimidine (ITU) as an organic catalyst. The resultant copolymers were analyzed using various techniques including 1 H NMR, FTIR, GPC and DSC. The micellar aggregates were formed from the amphiphilic block copolymers. The relationship between the architecture of block copolymers and their micellization properties, such as critical micelle concentration (CMC) and size of micelles, was… More >

  • Open AccessOpen Access

    ARTICLE

    A Novel SPEEK-PVA-TiO2 Proton Conducting Composite Membrane for PEMFC Operations at Elevated Temperature

    RABIRANJAN MURMU1,*, HAREKRUSHNA SUTAR1,2
    Journal of Polymer Materials, Vol.35, No.4, pp. 409-431, 2018, DOI:10.32381/JPM.2018.35.04.2
    Abstract A novel Sulfonated polyether etherketone (SPEEK) - Polyvinyl alcohol (PVA) -Titanium dioxide (TiO2 ) composite membrane is prepared for proton exchange membrane fuel cell (PEMFC) by solution casting method. In order to enhance the mechanical, thermal and hydrolytic stability of the SPEEK/PVA film; different compositions of TiO2 particles are dispersed as filler. Membrane uniformity is confirmed by Scanning Electron Microscopy (SEM). Composite membrane is characterized by FTIR, XRD, water uptake, Ion Exchange Capacity (IEC), DSC, TGA and Proton conductivity. Prepared composite membrane shows better water uptake capacity with lowering IEC. TiO2 has the significant effect on methanol permeability of the… More >

  • Open AccessOpen Access

    ARTICLE

    Amination of a Natural Polymer, Leucaena leucocephala (Lam.) galactomannan: Synthesis, Optimization and Characterization

    NEERAJ MITTAL, GURPREET KAUR*
    Journal of Polymer Materials, Vol.35, No.4, pp. 433-448, 2018, DOI:10.32381/JPM.2018.35.04.3
    Abstract Currently, biomedical, food, and pharmaceutical industries are exploring biocompatible, biodegradable, and readily available polymers as an alternative to synthetic polymers. The naturally occurring galactomannans comprising of galactopyranosyl (Gal) and mannopyranosyl (Man) residues are an attractive alternative to synthetic polymers due to their wide availability, and easily maniputable physical, and chemical properties. In the present study, a natural polymer, Leucaenea leucocephala galactomannan (LLG) was extracted from the seeds of Leucaenea leucocephala by an aqueous method, derivatized by reductive amination process using ethylene diamine as aminating agent to form aminated LLG (AMLLG). The conditions for amination were optimized by varying the concentration… More >

  • Open AccessOpen Access

    ARTICLE

    Influence of Moisture on Shape Memory and Mechanical Properties of Microwave-induced Shape Memory Polyurethane (PU)/graphene Nanoplatelets (GNPs) Composite

    KRISHAN KUMAR PATEL1,*, RAJESH PUROHIT1, S.A.R. HASHMI2, RITESH KUMAR GUPTA2
    Journal of Polymer Materials, Vol.35, No.4, pp. 449-462, 2018, DOI:10.32381/JPM.2018.35.04.4
    Abstract Microwave-induced shape memory polymer (Polyurethane)/Graphene nanoplatelets composite were prepared in micro-compounder. When samples exposed in moisture (immersed in water), the thermo-mechanical and shape memory properties such as Tensile strength, glass transition temperature, storage modulus, stretch and recovery strength were decreased. The surface morphology and dispersion of GNPs in PU matrix were characterized by using the Atomic Force Microscopy (AFM), X-ray Diffraction (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM). Further, we found that the PU specimen has no shape recovery during MV irradiations without moisture exposed sample. But moisture exposed PU sample shows shape recovery. With increasing water immersion time… More >

  • Open AccessOpen Access

    ARTICLE

    Fabrication of Fibre Metal Laminate with Flax and Sugar Palm Fibre based Epoxy Composite and Evaluation of their Fatigue Properties

    M. CHANDRASEKAR1,*, M.R. ISHAK1,2, S.M. SAPUAN3, Z. LEMAN2,3, M. JAWAID4, R.M.SHAHROZE1
    Journal of Polymer Materials, Vol.35, No.4, pp. 463-473, 2018, DOI:10.32381/JPM.2018.35.04.5
    Abstract Fibre metal laminate (FML) with the carbon, flax and sugar palm fibres were prepared by hand layup and hot press technique. Their tensile and fatigue properties were studied. Results indicate that both the tensile properties and fatigue behaviour was dependent on the natural fibre type and their stacking sequence in the laminate. Flax based FML showed promising results with superior tensile properties and fatigue life. It also displayed fibre bridging mechanism, a phenomenon responsible for the higher fatigue life. Introducing flax in combination with sugar palm fibre resulted in slightly higher fatigue life than the sugar palm fibre based FML.… More >

  • Open AccessOpen Access

    ARTICLE

    Fabrication and Characterization of Polyoxometalate based Nano-hybrids: Evaluation of their role in Biological Activity

    SHIVA ARUN1, PRABHA BHARTIYA2, AMREEN NAZ2, SUDHEER RAI2, S.S. NARVI2, P.K. DUTTA2,*
    Journal of Polymer Materials, Vol.35, No.4, pp. 475-484, 2018, DOI:10.32381/JPM.2018.35.04.6
    Abstract Polyoxometalates are a class of stable metal-oxide clusters with great molecular diversity having significant biological applications. Firstly, europium substituted polyoxometalate K4 H[Eu(α -SiW11O39)-(H2O)2].17H2 O (Eu-Si-POM) was synthesized and Eu-Si-POM was encapsulated into biocompatible chitosan (CS), through ionotropic gelation technique thus synthesizing a nano-hybrid (CS-Eu-Si-POM). CS-Eu-Si-POM retained the fluorescence property even after encapsulation. The nano-hybrid CS-Eu-Si-POM was characterized using FT-IR, UV-Vis spectra, fluorescence spectra, scanning electron microscopy (SEM), atomic force microscopy (AFM) and dynamic light scattering (DLS). Eu-Si-POM was further characterized by inductively coupled plasma (ICP) technique. These characterization techniques reveal the successful encapsulation of Eu-Si-POM within CS matrix by electrostatic… More >

  • Open AccessOpen Access

    ARTICLE

    Influence of Fiber Surface Energy on Mechanical Properties of Sisal Fiber - Bio Based Epoxy Composites

    S. RAJKUMAR1, R. JOSEPH BENSINGH1, M. ABDUL KADER1, SANJAY K NAYAK1
    Journal of Polymer Materials, Vol.35, No.4, pp. 485-496, 2018, DOI:10.32381/JPM.2018.35.04.7
    Abstract The main objective of this study is to correlate the surface energy and mechanical properties of bio-based composites and also to establish the relationship between surface energy and composite performance. The surfaces of sisal fibers are treated by NaOH and isocyanate reagents to improve the surface properties. The surface energy of the untreated and treated fibers were estimated from contact angle measurements by using the theoretical approach. The adsorption between fibers and matrix was also examined. Modified fiber surface showed better adsorption performance as compared to untreated fiber and thus indicated good wetting behaviour of the treated fibers. Fibers with… More >

  • Open AccessOpen Access

    ARTICLE

    Preparation of Phytic Acid Modified Polyurethane Wet Spinning Fibers for Application in Pb2+ Adsorption

    YINCHUN FANG1,*, XINHUA LIU1,2,*, XIAO WU1, XUCHEN TAO1
    Journal of Polymer Materials, Vol.35, No.4, pp. 497-506, 2018, DOI:10.32381/JPM.2018.35.04.8
    Abstract Polyurethane (PU) possesses excellent mechanical properties which has been used as the matrix for heavy metal ions removal. However, it has poor adsorption capacity due to there doesn’t exist chelating groups. In this study, phytic acid modified polyurethane (PU) fibers have been successfully prepared by wet spinning which was used for Pb2+ removal. The modified fibers achieved the highest adsorption capacity under the conditions of the mass ratio of phytic acid and PU was 5:7, the pH of Pb2+ solution was 6 and the adsorption temperature was 20 °C. The adsorption process of Pb2+ by phytic acid modified PU fibers… More >

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