✦ LIBER ✦

Elastomeric and mechanical properties of poly-m-carboranylenesiloxanes

✍ Scribed by L. H. Sperling; S. L. Cooper; A. V. Tobolsky

Publisher: John Wiley and Sons
Year: 1966
Tongue: English
Weight: 467 KB
Volume: 10
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1966.070101111

No coin nor oath required. For personal study only.

✦ Synopsis

A new high-temperature elwtomer, SiB-2, has been investigated by stress relaxation, niodulis-temperature, and volume-temperature techniques. SiB-2 was found to be more stable than a related elastomer, radiation-cured silicone rubber, having about twice as long a chemical relaxation time at 250°C. Possible mechanisms to account for this increased stability are discussed. At low temperatures, T , for SiB-2 was estimated at -34"C., which compares well with T, = -3OOC. for this polymer. By comparison, SiB-3 has T , = -60°C., while phenyl-modified SiB-4 was found to have T, = -25°C. T , for SiB-2 was estimated to be f 56°C.

* Ionox is 1,3,5-trimethyl-2,4,6-tris(3,5di-tertbutyl-4-hydroxybenzyl)ber1zene and is sold by the Shell Chemical Company.

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