Improved CPVC compounds: Miscible alloying with styrenic copolymers
Larry G. Bourland
Abstract
Larry G. Bourland
Abstract
Abstract Previous studies of PVC with styrene/maleic anhydride (SMAnh) copolymers showed miscibility or single phase morphology, but only at very low blended proportions of 10:1. At higher blend proportions this alloy system separated into two altered phases, neither being a pure component. Unlike PVC/SMAnh alloys, chlorinated poly(vinyl chloride) (CPVC) SMAnh systems show total miscibility for all blended proportions. The effects of alloying CPVC resins with SMAnh copolymers is the subject of this report. Using DSC and DMA miscibility of these systems are examined. Effects of SMAnh levels in these alloys on heat resistance, melt viscosity, processability, and flame retardance are assessed.
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Abstract Previous studies of PVC with styrene/maleic anhydride (SMAnh) copolymers showed miscibility or single phase morphology, but only at very low blended proportions of 10:1. At higher blend proportions this alloy system separated into two altered phases, neither being a pure component. Unlike PVC/SMAnh alloys, chlorinated poly(vinyl chloride) (CPVC) SMAnh systems show total miscibility for all blended proportions. The effects of alloying CPVC resins with SMAnh copolymers is the subject of this report. Using DSC and DMA miscibility of these systems are examined. Effects of SMAnh levels in these alloys on heat resistance, melt viscosity, processability, and flame retardance are assessed.
Key concepts: Miscibility, Chlorinated polyvinyl chloride, Copolymer, Materials science, Chemical engineering, Polymer chemistry, Polymer blend, Composite material