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New poly(silanes‐siloxanes) via hydrosilation in supercritical CO 2 and subsequent crosslinking
Author(s) -
Zhou Hui,
Venumbaka Sreenu R.,
Fitch III John W.,
Cassidy Patrick E.
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.200390020
Subject(s) - siloxane , silanes , hydrosilylation , polymer , supercritical fluid , materials science , supercritical carbon dioxide , polymer chemistry , curing (chemistry) , polymerization , benzene , chemical engineering , hydrolysis , catalysis , organic chemistry , silane , chemistry , composite material , engineering
In order to obtain crosslinkable, low dielectric, low Tg materials, the hydrosilation polymerization was carried out in supercritical carbon dioxide (SC CO 2 ) using Karstedt's catalyst, and a series of new fluorine‐containing poly(carbosilane/siloxane) were synthesized and characterized. The molecular weights of polymers obtained in SC CO 2 were notably greater than those obtained in benzene. Hydrolysis and thermal curing of these polymers leads to materials considerably higher molecular weight which retain their low Tg values.