Reaction of polysiloxanes and iron 2-ethylhexoate

Add time:08/01/2019    Source:sciencedirect.com

Iron 2-ethylhexoate is a salt of ferric iron and 2-ethylhexanoic acid. It is incorporated into silicone elastomeric formulations to provide high temperature stability by counteracting oxidative embrittlement. Though metallic salts are commonly used, the reaction of the salt with the siloxane is poorly understood. In this paper, the incorporation of iron 2-ethylhexoate as thermal stabilizer in the elastomer is studied with dynamic mechanical spectroscopy, FT-i.r. spectroscopy and 29Si n.m.r. The reaction involves conversion of the ferric salt to ferric silicate, volatilization of small, cyclic siloxanes, and reaction of the salt to hexanoic acid with partial conversion to anhydride.

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