✦ LIBER ✦

Dielectric relaxation and crosslinking in unsaturated polyester resins

✍ Scribed by George S. Learmonth; Geoffrey Pritchard

Publisher: John Wiley and Sons
Year: 1969
Tongue: English
Weight: 448 KB
Volume: 13
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1969.070131009

No coin nor oath required. For personal study only.

✦ Synopsis

The properties of crosslinked thermosetting resins depend markedly on the completeness of the crosslinking process. Determination of the degree of cure of an unsaturated polyester resin has been studied previously by mechanical, spectroscopic and volume resistivity methods. I n this respect the effect of cure time and temperature on the ac dielectric constant and dissipation factor a t 1 kc/s and 10 kc/s is considered. The dissipation factor appears to be a most useful parameter for detecting changes in the degree of cure in the later stages of reaction.

The electrical properties of the cured resin are discussed, and values for the energy of activation for electrical conduction are compared with literature reports on similar materials.

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