Abstract
Oligosiloxanes containing reactive hydroxyphenyl groups linked by the SiC bond to the siloxane chain have been prepared by hydrolysis of (2-(4-acetoxyphenyl)propyl)methyl-dichlorosilane and (3-(2-acetoxyphenyl)propyl)methyldichlorosilane and their cohydrolysis with dimethyldichlorosilane. It was found that when heated to 180° in the presence of hexamethylenetetraamine the oligosilanes hardened to crosslinked products. In addition, the rate and degree of crosslinking depend not only on the presence of hydroxyphenyl groups in the oligomers, but also on the number of active ortho- and para-positions.
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