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Siloxane/silane‐crosslinked systems from supercritical carbon dioxide: I. Fluorinated poly(ether/siloxane)s
Author(s) -
Zhou Hui,
Venumbaka Sreenu R.,
Fitch John W.,
Cassidy Patrick E.
Publication year - 2008
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.983
Subject(s) - siloxane , supercritical carbon dioxide , materials science , polymer , silane , supercritical fluid , solvent , polymer chemistry , toluene , ether , curing (chemistry) , organic chemistry , chemical engineering , chemistry , composite material , engineering
A series of new, fluorinated, silicone‐containing polymers with crosslinkable units has been synthesized by hydrosilation in toluene and supercritical carbon dioxide (70°C, 3000 psi) using platinum‐divinyltetramethyldisiloxane (Pt‐DVTMS) as a catalyst. The polymers were characterized by FTIR, NMR, GPC, TGA, and DSC. The molecular weights of these polymers ranged from 9,900 to 41,000. Comparison of the properties between reactions in toluene versus supercritical carbon dioxide indicated that the green solvent is a suitable alternative for hydrosilation. The hydrolysis and thermal curing of the crosslinkable precursor polymers produced higher molecular weight polymers with thermal stabilities ranging from 347 to 417°C. Copyright © 2007 John Wiley & Sons, Ltd.