✦ LIBER ✦

The effect of side groups on the dielectric relaxation of poly(methylhydrogensiloxane)

✍ Scribed by Andy A. Goodwin; Martin S. Beevers

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 484 KB
Volume: 196
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1995.021960509

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✦ Synopsis

The a-relaxation of a linear poly(methylhydrogensi1oxane) has been investigated as a function of temperature and frequency using dielectric relaxation spectroscopy. Replacement of the hydrogen with a hexyl group increased the temperature and broadness of the a-process, and this is interpreted in terms of a slowing of the motions of the Si-0 dipoles and plasticisation of the siloxane chain by the side groups. Replacement of the hydrogen with a mesogenic group produced a side-chain liquid crystal which exhibited dielectric relaxation behaviour characteristic of the glass and liquid crystalline states.

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