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Polymerization‐filled composites and nanocomposites by coordination catalysis
Author(s) -
Dubois Philippe,
Alexandre Michaël,
Jérôme Robert
Publication year - 2003
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.200390073
Subject(s) - materials science , nanocomposite , polymerization , composite material , hectorite , montmorillonite , elastomer , zirconium , composite number , metallocene , polymer , metallurgy
Polyolefinic microcomposites and layered silicate nanocomposites were prepared by the in‐situ polymerization of ethylene (and α‐olefin) via the so‐called polymerization‐filling technique. Various fillers with either basic, acidic, metallic or carbonaceous surface, as well as non‐modified clays such as montmorillonite and hectorite, were first treated by trimethylaluminum‐depleted methyialuminoxane before being contacted by a titanium or zirconium‐based metallocene catalyst. The (nano)composite was formed by addition and polymerization of ethylene (and α‐olefin). This technique makes possible the complete encapsulation of every filler particle within the (co)polyolefinic matrix ranging from thermoplastics to elastomers. The so‐obtained (nano)composites, often coined as “homogeneous” (nano)composites, exhibit improved mechanical properties, as compared to more conventional melt blends for a same filler content.