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首页> 外文期刊>Journal of Applied Polymer Science >Reactive melt blending of modified polyamide and polypropylene: Assessment of compatibilization by fractionated crystallization and blend morphology
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Reactive melt blending of modified polyamide and polypropylene: Assessment of compatibilization by fractionated crystallization and blend morphology

机译：改性聚酰胺和聚丙烯的反应性熔融共混：通过分步结晶和共混物形态评估相容性

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摘要

The melting and crystallization behavior of nonreactive and reactive melt-mixed blends of polypropylene and carboxylic-modified polyamide (mPA) as the dispersed phase was investigated. It was found that the size of the mPA particles decreases and the crystallization behavior of the mPA particles changes in dependence on the mixing time of the blends with oxazoline-modified PP (mPP). This indicates that an in situ reaction occurs between the oxazoline groups of mPP and the carboxylic acid groups of mPA, resulting in a compatibilizing effect. In blends with mPP, the crystallization of the dispersed mPA phase splits into two steps. Below a critical particle size, the mPA does not crystallize at temperatures typical for bulk crystallization. These finely dispersed mPA particles crystallize coincidently with the PP phase, and this part increases with increasing mixing time. Analysis of the crystallization heat of both steps in connection with the particle volume distribution permits the estimation of the critical particle size to be less than or equal to 4 mum. These investigations showed that the effect of fractionated crystallization can be used to follow the morphology development and to evaluate the efficiency of compatibilizing interfacial reactions during processing. (C) 2002 Wiley Periodicals, Inc. [References: 21]
机译：研究了聚丙烯和作为分散相的羧基改性聚酰胺（mPA）的非反应性和反应性熔融混合共混物的熔融和结晶行为。已经发现，mPA颗粒的尺寸减小，并且mPA颗粒的结晶行为取决于共混物与恶唑啉改性的PP（mPP）的混合时间而改变。这表明在mPP的恶唑啉基团和mPA的羧酸基团之间发生原位反应，从而产生增容作用。与mPP共混时，分散的mPA相的结晶分为两个步骤。低于临界粒度，mPA在本体结晶的典型温度下不会结晶。这些细分散的mPA颗粒与PP相一致地结晶，并且该部分随混合时间的增加而增加。与颗粒体积分布有关的两个步骤的结晶热的分析允许临界粒度的估计小于或等于4μm。这些研究表明，分级结晶的作用可用于跟踪形态发展并评估加工过程中相容性界面反应的效率。 （C）2002 Wiley Periodicals，Inc. [参考：21]

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