原位接枝改性纳米二氧化硅/聚丙烯复合材料 Ⅰ:结构表征

Polypropylene composites with nano-silica modified by in-situ grafting polymerization I: Structure characterization

以熔融原位接枝的方式,制得聚丙烯酸丁酯(PBA)接枝改性纳米SiO2/聚丙烯复合材料,并利用转矩流变、红外光谱、热重分析、X射线光电子能谱、透射电镜和动态力学分析等技术研究了原位接枝的机理以及相应复合材料的结构。结果表明:熔融共混过程中PBA通过化学键的形式接枝到纳米SiO2的表面,促使其在聚丙烯基体中得到较好的分散,而且粒子表面的接枝聚合物分子链和基体大分子链相互缠结,这样的结构加强了纳米粒子和基体间界面相互作用,将有利于提高复合材料的机械性能。

Polypropylene （PP） composites with polybutyl acrylate （PBA） in-situ grafted nano-silica were prepared by a conventional melt compounding technique. The mechanism of the graft polymerization and the structure of the nanocomposites were studied by means of Haake torque rheometer, infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, transmission electron microscopy, etc. It is proved that PBA has been chemically bonded to the surface of nano-silica during the in-situ melt graft polymerization. The modified nano-silica particles are homogeneously dispersed in PP matrix and a strong interfacial interaction is established by the chain entanglement between the grafted polymer and the matrix.