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Tetramethylammonium 3‐aminopropyl dimethylsilanolate—aminopropyl dimethylsilanolate—a new catalyst for the synthesis of high purity, high molecular weight α,ω‐bis(aminopropyl) polydimethylsiloxanes
Author(s) -
Hoffman Jerome J.,
Leir Charles M.
Publication year - 1991
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4990240302
Subject(s) - tetramethylammonium hydroxide , tetramethylammonium , silicone , polymer chemistry , catalysis , polymerization , ammonium hydroxide , molar mass distribution , materials science , ring opening polymerization , chemistry , organic chemistry , polymer , ion
Tetramethylammonium 3‐aminopropyl dimethylsilanolate, readily prepared from bis(3‐aminopropyl) tetramethyldisiloxane and tetramethyl‐ammonium hydroxide pentahydrate, has been found to serve as a highly effective catalyst for the ring opening polymerization of cyclic siloxanes with an end blocker such as bis(3‐aminopropyl) tetramethyldisiloxane to give aminopropyl terminated linear polydimethylsiloxanes. By following a novel two stage procedure, even high molecular weight (5,000–55,000 g/mol) silicone diamines were able to be prepared in a high state of purity; chain extension reactions of these diamines with diisocyanates gave a series of high molecular weight silicone polyureas with good elastomeric properties.