Calorimetric study of the miscibility of poly(2,6-dimethyl-1,4-phenylene oxide) with styrene-methyl methacrylate copolymers

Abstract

The miscibility of poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) with styrene-methyl methacrylate (S-MMA) copolymers was studied by differential scanning calorimetry. An S-MMA copolymer with a low MMA content is miscible with PPO when the PPO content in the blend is 40% or more. An increase in the MMA content in an S-MMA copolymer narrows the composition range in which the blend is miscible. An S-MMA copolymer containing 29.2 wt.% MMA is immiscible with PPO over the entire composition range. © 1988.