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Ethylamine and ammonia as catalysts in the in‐situ precipitation of silica in silicone networks
Author(s) -
Ning Y. P.,
Mark J. E.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760260209
Subject(s) - ethylamine , materials science , precipitation , ammonia , filler (materials) , silicone , catalysis , aqueous solution , hydrolysis , chemical engineering , colloid , precipitated silica , elastomer , composite material , organic chemistry , chemistry , natural rubber , physics , meteorology , engineering
Both ethylamine and ammonia in aqueous solutions catalyze the hydrolysis of tetraethylorthosilicate to precipitate silica filler within poly(dimethylsiloxane) elastomers. The rate of filler precipitation can vary in a complex manner, possibly due to loss of colloidal silica and, in the case of the ethylamine solutions, deswelling of the networks. Increase in catalyst concentration increases the precipitation rate, and increase in amount of filler precipitated dramatically increases the modulus and ultimate strength of the networks, thus demonstrating the desired reinforcing effects.