Abstract
Heat capacities of alternating, statistical and diblock copolymers of styrene and methyl methacrylate were measured with a differential scanning calorimeter from 200 to 450 K to examine the additivity of heat capacity. In both solid and liquid regions, the heat capacity was found to be additive, in most cases within ± 2% error irrespective of sequence length distribution. The glass transition temperatures, determined from enthalpy—temperature plots, depended on sequence length distribution as well as composition. This behaviour, although theoretically expected, was found to be complicated by another factor, tacticity.
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