BLENDS OF STYRENE ACRYLIC-ACID COPOLYMERS AND ACRYLIC POLYMERS

The miscibility of a series of styrene/acrylic acid copolymers with various polyacrylate and polymethacrylate homopolymers, as well as a series of styrene/methyl methacrylate copolymers, has been investigated. According to the binary interaction model, the miscibility diagram for styrene/acrylic acid copolymers with styrene/methyl methacrylate copolymers indicates that acid and ester groups interact endothermically. The phase behavior of the homopolymers also implies this. The analysis ignores the association and self‐association observed for the polymer blends and the low‐molecular‐weight analogs used to model them. The heat of mixing of low‐molecular‐weight analogs depended greatly on both composition and acid structure. Copyright © 1990 John Wiley & Sons, Inc.