Thermodynamics of polymers blends at elevated temperatures
The thermodynamic principles of the phenomen on of mutual miscibility of polymers have been discussed and several pairs of the homopolymer/homopolymer,homopoly-mer/random copolymer and random copolymer/random copolymer types (with particular consideration of PVC) which exhibit the lower critical solution temperature (LCST) have been presented. In binary homopolymer systems, miscibility is due to specific intermolecular interactions and in the systems comprising random copolymers miscibility is caused by strongly repulsive intramolecular interactions in copolymer. The reversibility of the thermally induced phase separation Has been confirmed experimentally. For several binary blends of polymers containing segments of winyl chloride, metyl methacrylate, butyl methacrylate, butyl acrylate, acrylonitrile, and styrene the values of the diffusion coefficients in the process of phase dissolution below LCST as well as the values of segmental interaction parameters have been determined.
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