Premium
High‐temperature elastomers: Glass transition–structure correlations for two systematic series of linear poly(carborane–siloxane)s. II. Incompatibility
Author(s) -
Roller M. B.,
Gillham J. K.
Publication year - 1972
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.1972.070161205
Subject(s) - glass transition , elastomer , siloxane , materials science , copolymer , polymer , polymer chemistry , carborane , polymer science , transition temperature , composite material , chemistry , organic chemistry , superconductivity , physics , quantum mechanics
Previously reported results related glass transition temperature to structure in two systematic series of poly(carborane–siloxane)s using a well‐known copolymer composition–glass transition relationship 1/ T g = W 1 / T g 1 + W 2 / T g 2 . The relationship was originally proposed to apply not only to copolymers, but also to diluent systems. Accordingly, mixtures of polymers within each series were prepared and the thermomechanical spectra were determined by the technique of torsional braid analysis. The binary mixtures included poly(dimethylsiloxane) with polymers in both series and a mixture of two CB 10 H 10 C siloxane polymers. In all cases, the thermomechanical spectra revealed only those transition regions characteristic of the individual components. This type of behavior is indicative of phase separation of incompatible polymeric species.