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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Fractionated Crystallization and Morphology in Binary Blends of Isotactic PP and HOPE with Cycloolefin Copolymers
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Fractionated Crystallization and Morphology in Binary Blends of Isotactic PP and HOPE with Cycloolefin Copolymers

机译：等规PP和HOPE与环烯烃共聚物的二元共混物的分级结晶和形态。

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摘要

Crystallization of binary blends of semi-crystalline polyolefins (i-polypropylene and HD-polyethylenes) and amorphous cy-cloolefin copolymers (COC) was followed by Differential Scanning Calorimetry (DSC).Blend morphologies were investigated by Scanning Electronic Microscopy (SEM).The thermal behavior and morphology of iPP-COC blends are characteristic of immiscible blends.The two crystallization exotherms observed on cooling from the melt were explained in terms of fractionated crystallization.This phenomenon occurs when iPP inclusions are finely dispersed in the COC matrix so that their number is much greater than the number of heterogeneities originally present in the bulk polymer,resulting in the suppression of the heterogeneous nucleation.A quite different behavior is observed in PE-COC blends.DSC and DMTA results show a significant decrease of both PE Tm and COC Tg,observations usually associated to some polymer miscibility in the amorphous phase.The crystallization mode and the resulting morphologies also appear to be largely dependent on the molecular weights and polydispersity indices of the dispersed phase.
机译：用差示扫描量热法（DSC）对半结晶聚烯烃（i-聚丙烯和HD-聚乙烯）和无定形环-氯烯烃共聚物（COC）的二元共混物进行结晶，然后通过扫描电子显微镜（SEM）研究混合形态。 iPP-COC共混物的热行为和形态是不溶混共混物的特征。从分馏结晶方面解释了从熔体冷却时观察到的两个结晶放热现象。当iPP夹杂物精细分散在COC基体中时，会发生这种现象。 PE-COC共混物的行为明显不同.DSC和DMTA结果表明PE Tm和COC均显着降低Tg，观察结果通常与某些聚合物在非晶相中的混溶性有关。最终的形态也似乎很大程度上取决于分散相的分子量和多分散指数。

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