INFLUENCE OF THE TACTICITY OF POLY(METHYL METHACRYLATE) ON ITS MISCIBILITY WITH CHLORINATED POLYMERS

Differential scanning calorimetry was used to determine the miscibility behavior of poly(methyl methacrylate) (PMMA)/chlorinated polymer blends. Nine PMMA's differing in tacticity were blended with three chlorinated polymers: poly(vinyl chloride) (PVC), a chlorinated PVC having a chlorine content of 68 percent (CPVC), and Saran, which is a random copolymer of vinyl chloride (12 percent) and vinylidene chloride (88 percent). The results show that all these PMMA's are miscible with PVC, CPVC, and Saran under proper thermal treatment and especially at 298 K.