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Heat‐resistant polymers containing the low molecular weight closo ‐carboranes. II. Thermal behavior of polycarboranesiloxane SiB‐1 elastomers from C 2 B 5 H 7
Author(s) -
Kesting R. E.,
Jackson K. F.,
Newman J. M.
Publication year - 1971
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.1971.070150620
Subject(s) - elastomer , polymer , copolymer , thermal stability , natural rubber , polymer chemistry , materials science , crystallization , mole , chemistry , organic chemistry , composite material
Unmodified 5‐SiB‐1 polymers have been found to be virtually equivalent to their 10‐SiB‐1 counterparts with respect to thermal stability. The 5‐SiB‐1 polymers, however, are substantially more amenable to conversion into elastomers. The introduction of 15 to 20 mole‐% of m ‐C 2 B 10 into the 5‐SiB‐1 backbone results in elastomers whose thermal stability, although less than that of the parent homopolymer, is nevertheless substantially in excess of the published values for the higher SiB polymers. The crystallization of the 5‐SiB‐1 copolymer containing 15 mole‐% C 2 B 10 was inhibited by irradiation with 50 megarads of 3 MeV betas. The 5‐SiB‐1 copolymer containing 20 mole‐% C 2 B 10 , on the other hand, remained a rubber at room temperature.