两种核-壳结构复合微球对聚丙烯的改性研究

摘要

Two kinds of core-shell composite microspheres with different interracial interaction, polystyrene/MCM-41-g-γ-methacryloxypropyltrimethoxysilane (PS/MCM-41-g-MPS) and poly(styrene-γ-methacryloxypropyltrimethoxysilane) / MCM-41 [P(St-MPS) / MCM-41] , were added into polypropylene (PP) to improve its properties. The composite microspheres were prepared by using adsorption self-assembly method and co-condensation synthesis method, respectively. The effects of composite microspheres and their loading amount on the mechanical properties and crystallinity of PP composites were investigated. The results show that two kinds of composite microspheres can significantly improve the mechanical properties of PP. The tensile strength of two kinds of PP composites increases 12 ％ and 13％ of pure PP when the content of composite microspheres PS/MCM-41-g-MPS and P(StMPS)/MCM-41 are 2％ mass fraction; the impact strength reaches the maximum when the composite microspheres are 4％ mass fraction, increases by 68％ and 63％ , respectively. The addition of composite microspheres also promote the formation of β crystal. However, there are some differences in mechanical properties and crystallinity of PP composites because the interracial interaction of two composite microspheres added is different. SEM shows that core-shell interracial interaction also directly affects their dispersion in the matrix and the toughening and reinforcing effect.%以吸附自组装和共缩聚法制备的PS/MCM-41-g-MPS和P(St-MPS)/MCM-41两种具有不同界面作用的"核-壳"结构复合微球为填料,对聚丙烯(Polypropylene, PP)进行改性,研究了复合微球种类及用量对PP力学与结晶性能的影响.结果表明:两种复合微球的添加均可以显著提高PP的力学性能,在复合微球PS/MCM-41-g-MPS和P(St-MPS)/MCM-41的添加量均为2%(质量分数,下同)时,两种PP复合材料的拉伸强度分别比纯PP提高了12%和13%;而添加量为4%时,两种复合材料的冲击强度分别提高了68%和63%,复合微球的添加也促进了β晶的形成;但由于两种复合微球核-壳界面作用的不同,对PP力学及结晶性能的改善作用具有一定的差异;SEM测试表明,核-壳粒子界面作用不同,直接影响其在基体中的分散及增韧增强效果.