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Elastomeric and mechanical properties of poly‐ m ‐carboranylenesiloxanes
Author(s) -
Sperling L. H.,
Cooper S. L.,
Tobolsky A. V.
Publication year - 1966
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1966.070101111
Subject(s) - elastomer , materials science , silicone rubber , composite material , polymer , stress relaxation , relaxation (psychology) , silicone , modulus , natural rubber , polymer chemistry , creep , psychology , social psychology
A new high‐temperature elastomer, SiB‐2, has been investigated by stress relaxation, modulus‐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 as a chemical relaxation time at 250°C. Possible mechanisms to account for this increased stability are discussed. At low temperatures, T g for SiB‐2 was estimated at –34°C., which compares well with T i = −30°C. for this polymer. By comparison, SiB‐3 has T i = −60°C., while phenyl‐modified SiB‐4 was found to have T i = −25°C. T m for SiB‐2 was estimated to be + 56°C.
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