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Phase behavior and rheology of blends containing polycarbonate and a thermotropic polyester
Author(s) -
Lee Sukmin,
Mather Patrick T.,
Pearson Dale S.
Publication year - 1996
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/(sici)1097-4628(19960110)59:2<243::aid-app8>3.0.co;2-x
Subject(s) - thermotropic crystal , polycarbonate , miscibility , materials science , liquid crystal , rheology , polyester , isotropy , phase (matter) , anisotropy , polymer , polymer chemistry , composite material , thermodynamics , organic chemistry , liquid crystalline , chemistry , optics , physics , optoelectronics
The phase behavior and rheology of binary blends of polycarbonate (PC) and a liquid crystalline polymer (LCP) have been investigated. The thermotropic LCP employed was a semiflexible polyester synthesized by melt condensation of t ‐butylhydroquinone and 4,4′ dichloroformyl‐α,ω‐diphenoxyhexane. It shows a distinct nematic‐to‐isotropic transition in the pure state and in the blends. Results of DSC and optical microscopy indicate that the LCP is solubilized in the mixture for weight fractions of LCP less than about 0.05 and shows partial miscibility with PC over the rest of the composition range. The phase separation is considered to be driven by both isotropic and anisotropic interactions between constituent chains. Dynamic oscillatory measurements show that there is some interaction between the separate isotropic and anisotropic phases, with complex viscosities of the blends being intermediate between those of pure components and showing significant deviation from a logarithmic rule‐of‐mixtures. © 1996 John Wiley & Sons, Inc.