ポリメチルヒドロシロキサン 化学特性,用途語,生産方法
定義
本品は、直鎖状のモノメチルポリシロキサンであり、次の化学式で表される。
化粧品の成分用途
閉塞剤、表面改質剤
化学的特性
clear colorless viscous liquid
物理的性質
colorless free flowing liquid; average molecular
weight 1500-2200 g mol
?1 (supplier dependent); effective mass
per hydride of 60 g mol
?1; d = 1.006.
使用
Polymethylhydrosiloxane (PMHS) is an easily handled, inexpensive, non-toxic, and mild reducing agent. Although relatively inert towards organic functionality, PMHS can transfer its hydride to a variety of metal catalysts (including Sn, Ti, Zn, Cu, and Pd) which can then participate in a wide range of reductions. Alternatively, when made hypercoordinate by the action of fluoride or other nucleophiles, PMHS can act directly as a reducing agent. Polymethylhydrosiloxane is widely used as reducing agent often used in conjunction with metal catalysts or
nucleophilic activators.
製造方法
hydrolysis of methyldichlorosilane followed
by heating (60–150 °C) the resultant mixture of cyclic
silanes in the presence of hexamethyldisiloxane generates the
linear polysiloxane.
ポリメチルヒドロシロキサン 上流と下流の製品情報
原材料
準備製品