High Temperature Elastomers: Glass Transition-Structure Correlations for Two Systematic Series of Linear Poly(Carborane-Siloxane)s.
Technical rept. Sep 69-Jan 72,
PRINCETON UNIV N J DEPT OF CHEMICAL ENGINEERING
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Nine polycarborane-siloxane high temperature elastomers which differ systematically in chemical structure were investigated by Torsional Braid Analysis. The structural variations include two different carborane cage structures in the polymer chain -CB10H10C- and -CB5H5C- and the step-wise increase in the number of -SiCH32-O- linkages associated with each cage in the repeat unit. Polydimethyl-siloxane was studied as the compositional limit of both series. The dynamic mechanical relaxations about 1 cps of the materials are reported. These include the melting points of the semi-crystalline polymers, and the glass transitions and secondary transitions of all the polymers. The glass transition temperatures in each series were systematized using a well known copolymer composition versus glass transition temperature relationship. Author
- Elastomers and Rubber