High Temperature Elastomers: Glass Transition-Structure Correlations for Two Systematic Series of Linear Poly(Carborane-Siloxane)s.
Abstract
Nine poly(carborane-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 -Si(CH3)2-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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1972
- Accession Number
- AD0748931
Entities
People
- John K. Gillham
- M. B. Roller
Organizations
- Princeton University