Nanocomposites by in situ polymerization of olefins with metallocene catalysts
Nanocomposites by in situ polymerization of olefins with metallocene catalysts
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DOI：
10.1002/masy.200650701
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发表时间：
2006-01-01
影响因子：
--
通讯作者：
Wiemann, K.
中科院分区：
文献类型：
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作者：
Kaminsky, W.;Funck, A.;Wiemann, K.
使用茂金属/甲基铝氧烷（MAO）催化剂，用可变厚度的聚烯烃膜均匀地涂覆纳米颗粒如二氧化硅球（球）、碳酸钙、碳纳米管（CNT）或纤维（CF）。催化剂吸附在填料表面上，导致聚合物直接在其表面上生长。获得了基于聚乙烯（PE）和间同立构或全同立构聚丙烯（sPP/iPP）的高度填充和刚性的纳米复合材料，其中二氧化硅含量高达85wt%或多壁碳纳米管（MWCNT）含量高达7wt%。以同样的方式与MAO处理的MWCNT形成异相助催化剂制备异规和间规PP/MWCNT复合材料，太。分散的均匀性主要取决于填料的预处理。
Nanoparticles such as silica balls (monopheres), calcium carbonate, carbon nanotubes (CNT) or fibers (CF) are uniformly coated with a film of polyolefins of variable thickness using metallocene/methyl-aluminoxane (MAO) catalysts. The catalyst is adsorbed on the filler surface, leading to a polymer growth directly on its surface. Highly filled and stiff nano composites, basing on polyethene (PE) and syndiotactic or isotactic polypropene (sPP/iPP) with a content up to 85 wt% Of silica or 7 wt% of multi-walled carbon nanotubes (MWCNT) are obtained. MWCNT treated with MAO in the same way form a heterogenous cocatalyst for the preparation of iso- and syndiotactic PP/MWCNT composites, too. The uniformity of the dispersion depends primarily on the pretreatment of the filler.