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Miscible Blends Of A Thermotropic Liquid Crystalline Polymer And Sulfonated Polystyrene Ionomers, Robert Weiss, Y. Ghebremeskel, L. Charbonneau
Miscible Blends Of A Thermotropic Liquid Crystalline Polymer And Sulfonated Polystyrene Ionomers, Robert Weiss, Y. Ghebremeskel, L. Charbonneau
Robert Weiss
The miscibility of a wholly aromatic thermotropic liquid crystalline polyester (LCP), Vectra® A, with lightly sulfonated polystyrene ionomers (SPS) was assessed. Blends were prepared by melt mixing in an intensive mixer. The sulfonation level and the choice of the cation used to neutralize the ionomer influenced miscibility. Zinc salts of an SPS with 5.3 mol% sulfonation were miscible at all compositions with the LCP, but lithium salts with the same sulfonation level formed two phases, a pure LCP phase and an ionomer-rich mixed phase. Zinc salts of an ionomer with 10.8 mol% sulfonation were also miscible with the LCP when …
Miscible Blends Formed From Intrapolymer Repulsive Interactions: 2. Phase Behavior Of Blends Of Bisphenol A Polycarbonate And Zinc-Sulfonated Polystyrene Ionomers, Rui Xie, Robert Weiss
Miscible Blends Formed From Intrapolymer Repulsive Interactions: 2. Phase Behavior Of Blends Of Bisphenol A Polycarbonate And Zinc-Sulfonated Polystyrene Ionomers, Rui Xie, Robert Weiss
Robert Weiss
The phase behavior of mixtures of bisphenol A polycarbonate and the zinc salts of lightly sulfonated polystyrene ionomers (Zn-SPS) was studied as a function of the sulfonation level and the molecular weight of the ionomer. This system exhibits upper critical solution temperature (UCST) phase behavior and miscibility is attributed to intramolecular repulsion between the ionic and non-ionic groups of the ionomer. The cloud point temperature decreased with increasing sulfonation level of the ionomer over the range of 8.7–13.7 mol.%, and it inscreased with increasing molecular weight of Zn-SPS for a fixed sulfonation level. Fourier transform infrared spectroscopy revealed that no …