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Simultaneous hydrosilation and ring‐opening polymerization as a route to novel polymer architectures
Author(s) -
Crivello James V.,
Fan Mingxin
Publication year - 1994
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.19940770143
Subject(s) - polymerization , polymer , materials science , polymer chemistry , hydrosilylation , ring (chemistry) , polymer science , chemical engineering , chemistry , composite material , organic chemistry , catalysis , engineering
Typical platinum, rhodium and cobalt hydrosilation catalysts have been found to catalyze the ring‐opening polymerization of many different types of heterocyclic monomers. In particular, epoxide monomers undergo especially rapid polymerization with these catalysts. Investigations have shown that in the case of platinum and rhodium catalysts these polymerizations proceed at the surface of the metal colloids by means of a novel cationic mechanism. In contrast, polymerizations with octacarbonyldicobalt take place by a homogeneous cationic mechanism. In all cases, polymerization appears to proceed by the formal attack of a positively charged silicon species on the heteroatom with the formation of a silicon‐oxygen bond. Interesting comb, graft, block and network polymers can be prepared by carrying out simultaneous epoxide ring‐opening and hydrosilation reactions using these catalysts.