Glass transition behaviors of random and block copolymers and polymer blends of styrene and cyclododecyl acrylate. I. Glass transition temperatures

Abstract

Glass transition temperatures have been studied for the random and block copolymers of styrene and cyclododecyl acrylate. The random copolymers showed a single glass transition temperature, which provided a concave glass transition temperature—composition curve. This concave relationship was fairly well represented by the modified Gibbs—Dimarzio equation of Uematsu and Honda, which includes the influence of the specific character of cyclododecyl acrylate as a monomeric unit. Each of the block copolymers as well as the blends of their component homopolymers showed two separated glass transition temperatures corresponding to the respective ones of poly(cyclododecyl acrylate) and polystyrene; these were independent of the total composition, owing to the incompatibility of the components. © 1975 The Society of Polymer Science, Japan. All Rights Reserved.