Abstract
An azeotropic copolymer of styrene and acrylonitrile was studied with its gelation process via the cyclodiborazane formation between thexylborane (TB) and the cyano groups of the copolymer in 2-methoxyethyl ether solution. The concentrations of TB, cyano groups, and iminoborane were in situ determined by infrared spectroscopy. In addition, the number density of cross-links, i.e., the concentration of cyclodiborazane was quantitatively estimated after the treatment with methanol, which reacts with the B-H groups of TB and iminoborane without decomposition of cyclodiborazane. The number of cross-links was found to increase with reaction time, reaching about 3 per chain at the gel point for the copolymer used in this study.
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Schedule a callMore From: Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)
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