新型茂钛催化剂原位本体聚合法制备间规聚苯乙烯/蒙脱土纳米复合材料

采用多碳氨基酸对蒙脱土进行改性 ,得到改性蒙脱土 (MTN) ,并使其层间距扩大 ,在一定条件下用茂金属催化剂Cp Ti(O C6 H4 F) 3 进行苯乙烯原位聚合发现 ,在氨基酸改性的蒙脱土存在下 ,茂金属催化剂活性有所提高 ,能制得间规聚苯乙烯 (sPS) 蒙脱土纳米复合材料 ,考察了蒙脱土用量对配位聚合的影响及该复合材料的形态结构、热稳定性和结晶性能

In-situ PREPARATION OF sPS/MONTMORILLONITE NANOCOMPOSITES WITH MONOTITANOCENE CATALYTIC SYSTEM

Syndiotactic polystyrene(sPS)/montmorillonite nanocomposites were prepared v ia in site intercalative coordination with Cp *Ti(O C 6H 4 F) 3/MAO/TiBA c atalytic system. The montmorillonite modified with 12\|aminododecanoic acid can increase catalytic activity on some degree.The nanostructure features were revea lded by X\|ray diffraction and transmission electron micrographs.It was found th at montmorillonite could be dispersed in the sPS as sheets of 40 nm thich by in\|situ syndiotactic polymerization.However, the interaction between the o rgan ic material and silicate layer of clay is not thermally stable enough to resist the high melt processing temperature of sPS, so nanocomposite could not be achie ved by melt mixing directly. The thermal properties of pure sPS and sPS/ MTN were investigated. The crystallization temperature and relative crystallinit y of the fabricated nanocomposite (3\^57% MTN wt in sPS) increased obviously , it also had good thermal stability, the thermal decomposition temperature was a bout 50℃ higher than that of the pure syndiotactic polystyrene.