Nanocomposites by In Situ Polymerization of Olefins with Metallocene Catalysts
2006; Wiley; Volume: 239; Issue: 1 Linguagem: Inglês
10.1002/masy.200690084
ISSN1521-3900
AutoresWalter Kaminsky, Andreas Funck, Katharina Wiemann,
Tópico(s)Carbon Nanotubes in Composites
ResumoAbstract 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.
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