Morphology of high impact polypropylene particles

Morphology of high impact polypropylene particles
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DOI：
10.1016/j.polymer.2006.07.053
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发表时间：
2006-09
期刊：
Polymer
影响因子：
4.6
通讯作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang
Yong Chen;Ye Chen;Wei Chen;Decai Yang
中科院分区：
化学2区
文献类型：
--
作者：
Yong Chen;Ye Chen;Wei Chen;Decai Yang

文献摘要

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采用场发射电子显微镜（FESEM）和透射电子显微镜（TEM）研究了多级聚合法制备的等规聚丙烯（iPP）和高冲击聚丙烯（hiPP）颗粒的形态特征。研究主要集中在iPP颗粒的结构和预成型iPP基体中弹性体相（EPR）的分布。iPP粒子是许多亚球（直径约为几到几百微米）的聚集体，而亚球又由大量原球（直径约100纳米）形成。亚球之间的大孔隙和亚球内部分布精细的微孔隙构成了iPP颗粒内部的孔隙网络。乙烯/丙烯共聚物可以扩散到宏观和微孔中，并在位于孔外围的催化剂活性位点上共聚，形成弹性体相。
Morphological features of isotactic polypropylene (iPP) and high impact polypropylene (hiPP) particles produced in a multistage polymerization process were investigated by field-emission electron microscopy (FESEM) and transmission electron microscopy (TEM) techniques. Study was mainly focused on architecture of iPP particle and distribution of elastomer phase (EPR) within the preformed iPP matrix. The iPP particle is an agglomerate of many subglobules (ca. several to hundred microns in diameter), while the subglobule in turn is formed by a great deal of primary globules (ca. 100nm in diameter). Large macropores between the subglobules and finely distributed micropores within the subglobule constitute a network of pore inside the iPP particle. Ethylene/propylene comonomers can diffuse into the macro- and micropores and copolymerize on catalyst active sites located on periphery of the pores, forming elastomer phase inside.