Accession Number : AD0748931

Title :   High Temperature Elastomers: Glass Transition-Structure Correlations for Two Systematic Series of Linear Poly(Carborane-Siloxane)s.

Descriptive Note : Technical rept. Sep 69-Jan 72,

Corporate Author : PRINCETON UNIV N J DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Gillham,John K. ; Roller,M. B.

Report Date : JAN 1972

Pagination or Media Count : 17

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)

Descriptors :   (*INORGANIC POLYMERS, *ELASTOMERS), (*HEAT RESISTANT PLASTICS, INORGANIC POLYMERS), TORSION, SILICONE PLASTICS, CARBON COMPOUNDS, MOLECULAR STRUCTURE, PHASE STUDIES, TRANSITION TEMPERATURE, SILOXANES, MECHANICAL PROPERTIES

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE