Home / Journals / JPM / Vol.34, No.3, 2017
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    ARTICLE

    The Interaction between Crystallization Behavior and Foaming Performance in the Foamed Polypropylene

    JINSONG WEN, LIRONG CHEN, XIANWU CAO, YIJUN ZHANG
    Journal of Polymer Materials, Vol.34, No.3, pp. 513-524, 2017
    Abstract Three types of polypropylene, namely homo-polypropylene (HPP), block copolymer of propylene with ethylene (CPP-B) and random copolymer of propylene with ethylene (CPP-R) were melted and foamed in a self-designed vessel under supercritical carbon dioxide (Sc-CO2 ) atmosphere. The melting behavior, crystalline forms and foaming performance of foamed samples were investigated using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD) and scanning electron microscope (SEM). The results showed that foaming process parameters greatly influence the crystallization behavior and foaming performance of samples. With the increasing of polypropylene contents, crystallinity, cell density was increased. Furthermore, under the certain critical condition, CO2 can… More >

  • Open AccessOpen Access

    ARTICLE

    Renewable Resource based blends of Polylactic acid (PLA) and Thermoplastic starch (TPS) using Novel Reactive Compatibilization

    SUKHILA KRISHNAN*, SMITA MOHANTY, SANJAY K.NAYAK
    Journal of Polymer Materials, Vol.34, No.3, pp. 525-538, 2017
    Abstract The current work deals with enhancing the compatibility between thermoplastic starch (TPS) and polylactic acid (PLA) blends. TPS was initially modified with methylene diphenyldiisocyanate (MDI) / epoxidized soybean oil (ESO) to reduce its hydrophilic nature. The effect of MDI / ESO incorporation on the properties of PLA/TPS blend was evaluated by employing thermal, mechanical, morphological and water absorption studies. Morphological studies showed that in comparison to TPS, TPS modified by MDI and ESO were uniformly dispersed within the PLA matrix and exhibited higher impact energy as compared with neat PLA. More >

  • Open AccessOpen Access

    ARTICLE

    Numerical Analysis of Damage Mechanism on Lowvelocity Impact of GLARE 5 Fiber-metal Laminates

    YUN WAN*, GUSHENG TONG, SHENSHEN CHEN, YONGHU HUANG
    Journal of Polymer Materials, Vol.34, No.3, pp. 539-552, 2017
    Abstract The impact performance play an important role in marine material. A numerical methodology including user material subroutine VUMAT, Johnson–Cook flow stress model and surfacebased cohesive behavior is carried out to simulate the damage evolution of the impact of GLARE 5 fiber-metal laminates (FML). Specially, user material subroutine VUMAT and surfacebased cohesive behavior are employed to solve composite and interface delamination in numerical simulation of low-velocity impact on GLARE 5 FML. By parameters study, proper properties of fiber reinforced layers and surface-based cohesive behavior are given. Moreover, the damage progression of fiber reinforced layers, aluminum alloy layers and delamination in FML… More >

  • Open AccessOpen Access

    ARTICLE

    The Study of Impact Properties of UDF/epoxy Composites with Shape Memory Alloy Wires (SMAs) under Low Velocity Impact

    ZHENQING WANG*, MIN SUN, YAHUI CHEN, LIANG HE, FANGXIN WANG
    Journal of Polymer Materials, Vol.34, No.3, pp. 553-563, 2017
    Abstract The objective of this investigation is to study the impact properties of unidirectional glass fiber (UDF) reinforced epoxy laminates with shape memory alloy wires (SMAs) inserted. The SMAs/ GF/epoxy laminates are manufactured with vacuum assisted resin injection (VARI) process. Then, the low velocity impact tests of such laminates were conducted at room temperature. The experimental result shows that the impact properties of laminates can be improved by embedding SMAs which may be due to the super-elasticity capacity of shape memory alloy wires (SMAs). The position of SMAs insertion has an effect on impact properties of composites, and the laminate with… More >

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