Powdered MQ resin platinum complexes and their use as silicone-soluble hydrosilylation cure catalysts

被引：25

作者：

Lewis, LN ^{[1
]}

Wengrovius, JH ^{[1
]}

Burnell, TB ^{[1
]}

Rich, JD ^{[1
]}

机构：

[1] GE SILICONES,WATERFORD,NY 12188

来源：

CHEMISTRY OF MATERIALS | 1997年 / 9卷 / 03期

关键词：

D O I：

10.1021/cm960465h

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Moldable poly(dimethylsiloxane) formulations are described which use so-called MQ resins as reinforcing fillers. These formulations employ platinum-catalyzed hydrosilylation as the cure reaction. The platinum catalysts were prepared by spray-drying solutions composed of vinyl-containing MQ resins with platinum(0) complexes of divinyltetramethydisiloxane (M(vi)M(vi)) ligands. The spray-dried mixture was a white, free-flowing powder containing 1% by weight platinum where the platinum was Pt(0) and coordinated to the vinyls of the MQ resin. Molecular MQ resin-platinum complexes, free of platinum crystallites were obtained by spray-drying but not by vacuum oven treatment of solutions of resin and Pt(M(vi)M(vi))(x) complexes. Oven-prepared, platinum-containing resins contained platinum crystallites. The platinum-containing spray-dried MQ resin was a useful catalyst to cure moldable poly(dimethylsiloxane) formulations. Higher catalytic activity was observed for resin without platinum crystallites. Analyses of the platinum-containing MQ resins included Pt-195 NMR and TEM.

引用

页码：761 / 765

页数：5

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