Heat capacity of random copolymers of styrene and methacrylates

Differential scanning calorimetry has been used to investigate the thermal behavior of random copolymers of styrene and hexyl methacrylate and of styrene and glycidyl methacrylate in the temperature range of 20° to 150°C. Heat capacities of the copolymers and homopolymers, poly-(hexyl methacrylate), poly(glycidyl methacrylate), and polystyrene have been measured. It is found that the heat capacities of the homopolymers from 60°K to the glass transition temperatures can be adequately obtained by Wunderlich's empirical method. It is also found that the copolymer heat capacities can be adequately represented by addition of homopolymer heat capacities.