Nascent Phase Separation and Crystallization Kinetics of an iPP/PEOc Polymer Alloy Prepared on a Single Multicatalyst Reactor Granule
Nascent Phase Separation and Crystallization Kinetics of an iPP/PEOc Polymer Alloy Prepared on a Single Multicatalyst Reactor Granule
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DOI：
10.1021/ma7021869
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发表时间：
2008-02
期刊：
影响因子：
5.5
通讯作者：
Jiang Du;H. Niu;Jin‐Yong Dong;Xia Dong;Dujing Wang;and Aihua He;C. Han
中科院分区：
文献类型：
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作者：
Jiang Du;H. Niu;Jin‐Yong Dong;Xia Dong;Dujing Wang;and Aihua He;C. Han
采用偏光显微镜、相差显微镜和扫描电子显微镜（SEM）研究了多催化剂反应器颗粒上制备的等规聚丙烯/乙烯-辛烯共聚物（iPP/PEOc）聚合物合金的结晶形态和液-液相分离（LLPS）。我们发现，LLPS工艺对iPP/PEOc聚合物合金的最终结晶形态具有主导作用。当样品在140 ° C等温结晶时，随着在160 °C下LLPS时间的增加，越来越多的弹性体组分作为液滴均匀地分散在iPP球晶中，而不是被排斥到外部并集中在球晶的边界处。其形貌可用相分离和结晶动力学来解释。通过简单地改变LLPS时间，我们可以控制分散在iPP球晶中的弹性体液滴的尺寸（例如在1 μ m和10 μm之间）。同时，一个特殊的结构特征...
The crystalline morphology and the liquid−liquid phase separation (LLPS) of an isotactic polypropylene/poly(ethylene-co-octene) (iPP/PEOc) polymer alloy prepared on a single multicatalyst reactor granule were studied by polarized optical microscope, phase contrast optical microscope, and scanning electron microscopy (SEM). We found that the LLPS process had a dominant effect on the final crystalline morphology of the iPP/PEOc polymer alloy. As the LLPS time was increased at 160 °C, more and more elastomer component was dispersed uniformly in the iPP spherulites as droplets, instead of being rejected to the outside and concentrated at the boundaries of the spherulites, when the sample was isothermally crystallized at 140 °C. The morphologies can be explained by the phase separation and crystallization kinetics. By simply changing the LLPS time, we could control the size of the elastomer droplets (for example between 1 and 10 μm) that dispersed in the iPP spherulites. Meanwhile, a special structural feature...