无机刚性粒子增韧增强PP研究进展

Research Progress in the Toughening and Strengthening of Polypropylene via Inorganic Rigid Particles

综述了近些年来无机刚性粒子增韧聚丙烯(PP)的结构设计、刚性粒子粒径及其分布、改性剂种类及用量对增韧增强效果的影响以及无机刚性粒子增韧PP的机理。大量的研究表明,在刚性粒子增韧PP中,弹性体包覆刚性粒子的壳-核结构设计具有优异的增韧效果。在定量分析PP增韧机理方面,介绍了脆韧转变分析中界面黏结判据和粒间距判据,以及有限元方法在此领域的应用,刚性粒子增韧机理主要为界面脱黏到空洞／银纹化损伤和空洞／剪切屈服损伤的转变。此外还介绍了目前刚性粒子与橡胶混杂增韧PP的研究进展。

The works in toughening and strengthening of polypropylene via inorganic rigid particles were reviewed. The effect of morphology of the filling system, the particle size and distribution, and modifier on the toughening were summarized. It was extensively reported that excellent toughening resulted from a core-shell structure generated by encapsulating rigid particles with elastomer. Sophisticated analysis of PP toughening was discussed, including the criterion of critical matrix ligament thickness, the criterion of interface adhesion, finite element analysis, the transition from debonding to the cavitation/crazing and the cavitation/shear yielding. The hybrid toughening using elastomer and rigid inorganic particles was also mentioned.