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Nanocomposites by In Situ Polymerization of Olefins with Metallocene Catalysts
Author(s) -
Kaminsky W.,
Funck A.,
Wiemann K.
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690084
Subject(s) - materials science , tacticity , nanocomposite , metallocene , post metallocene catalyst , composite material , carbon nanotube , catalysis , polymer , in situ polymerization , dispersion (optics) , polymerization , chemical engineering , nanoparticle , polymer chemistry , nanotechnology , organic chemistry , chemistry , engineering , physics , optics
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.