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Effect of the matrix modification technique (MMT) on the composition, microstructure, morphology, interfacial interaction and mechanical properties of polypropylene reactor alloys

机译：基质改性技术（MMT）对聚丙烯反应器合金的组成，微观结构，形态，界面相互作用和力学性能的影响

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摘要

In this paper, a new approach was applied to improve phase compatibility of isotactic polypropylene (iPP) reactor alloys through a matrix modification technique (MMT). The matrix phase of a heterophasic block copolymer was prepared using a 4th generation Ziegler-Natta catalyst and was modified by 0.5, 1, 1.5 and 3 wt% ethylene as a co-monomer along with propylene. Evaluation of quantitative FTIR spectroscopy revealed that the ethylene content of the matrix is similar to the amount of injected ethylene in the reactor during the matrix preparation stage. Copolymerization and post homopolymerization conditions for all the samples were similar. It was found that the co-monomer content of the modified matrix strongly affects the cold soluble xylene fraction and also the microstructure of iPP reactor alloys. Morphological studies using scanning electron microscopy confirmed the significant improvement in the morphology of reactor alloys when 1 and 1.5 wt% ethylene were randomly copolymerized with propylene during the matrix preparation stage and almost single-phase morphology was observed when 3 wt% ethylene was added in the matrix. The interfacial interaction between ethylene propylene rubber (EPR) and the matrix was determined by Pal and Palierne emulsion models, and the results revealed an improvement of phase compatibility between the matrix and the dispersed phase when 1.5 wt% ethylene was used in its modified matrix. Thermal analysis showed that by increasing the co-monomer content in the modified matrix, the degree of crystallinity and the melting point (T-m) decrease. Mechanical tests indicated that the effect of the MMT on improving the phase compatibility and toughness of reactor alloys is higher than that of the dispersed phase content.
机译：本文采用了一种新方法来改善通过基质改性技术（MMT）的同位聚丙烯（IPP）反应器合金的相位相容性。使用第4代Ziegler-Natta催化剂制备多相嵌段共聚物的基质相，并用0.5,1,1.5和3wt％乙烯作为共聚单体和丙烯改性。定量FTIR光谱的评价显示，基质的乙烯含量类似于在基质制备阶段期间反应器中注射乙烯的量。所有样品的共聚合和后均聚条件是相似的。发现改性基质的共聚单体含量强烈影响冷溶性二甲苯馏分以及IPP反应器合金的微观结构。使用扫描电子显微镜的形态学研究证实了当在基质制备阶段1和1.5wt％乙烯中随机共聚反应器合金的形态的显着改善，当加入3wt％乙烯时，几乎观察到几乎单相形态矩阵。通过PAL和PALIERNE乳液模型测定乙烯丙烯橡胶（EPR）和基质之间的界面相互作用，结果表明，当在其改性基质中使用1.5wt％乙烯时，基质和分散相之间的相位相容性的提高。热分析表明，通过增加改性基质中的共单体含量，结晶度和熔点（T-M）降低。机械测试表明，MMT对改善反应器合金的相位相容性和韧性的影响高于分散相含量的影响。

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  • 来源
    《RSC Advances》 |2015年第130期|共10页
  • 作者

    Mousavi Seyed Omidreza; Jahani Yousef; Arabi Hassan;

  • 作者单位

    Iran Polymer &

    Petrochem Inst Fac Polymer Proc Tehran Iran;

    Iran Polymer &

    Petrochem Inst Fac Polymer Proc Tehran Iran;

    Iran Polymer &

    Petrochem Inst Fac Engn Tehran Iran;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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