摘要
采用化学反应法制备了Ziegler-Natta/有机改性蒙脱土复合催化剂,并通过丙烯单体原位插层聚合法制备出聚丙烯/蒙脱土(PP/MMT)纳米复合材料,研究了复合材料的微观结构、热性能以及加工稳定性等。结果表明,原位聚合法制备的复合材料为剥离型纳米复合材料,其中MMT片层以纳米尺寸均匀分散在PP基体中,MMT平均厚度小于10nm;随MMT含量的提高,复合材料的热稳定性提高;原位聚合制备的PP/MMT纳米复合材料在长时间剪切过程中部分MMT会发生自聚集,控制剪切时间可以有效防止MMT的自聚集;原位聚合制备的PP/MMT复合材料(粉料)中,PP以α晶型为主,纳米MMT的引入并不会诱导生成聚丙烯β晶型,复合材料中β晶型的出现与退火条件有关。
Polypropylene （PP）/ montmorillonite （MMT） nanocomposites were synthesized by /n situ polymerization with Ziegler-Natta/organically modified MMT compound catalyst prepared by chemical reaction method. The microstructure, thermal stability and the processing stability of PP/MMT nanocomposites were investigated systematically. The results indicate that the exfoliated PP/MMT. nanocomposites are produced successfully by in situ polymerization, and the MMT nanolayers are dispersed uniformly in the PP matrix in the nano scale. The average thickness of the MMT layers in PP matrix is less than I0 rim. The increase of MMT content enhances the thermal stability of PP/MT nanoconposite materials. The long-time shearing inevitably leads to the aggregation of some MMT layers, and this aggregation of MMT can be avoided by shortening the shearing time. The α phase is the dominate crystal phase of PP in the in situ synthesized PP/MMT nanocomposites, and the introduction of nano clay can not induce the β phase PP formation. The appearance of β phase PP is related with the annealling temperature.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2010年第1期132-137,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金项目(20774098)
国家重点基础研究发展计划(973)项目(G2003CB615605)
关键词
聚丙烯
蒙脱土
纳米复合材料
原位聚合
polypropylene
montmorillonite
nanocomposites
in situ polymerization
作者简介
王丽梅（1978-），女．山东德州人，德州学院讲师，硕士。
通讯联系人：贺爱华，E-mail：aihuahe@iccas.ac．cn
