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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Effects of sequence length distribution on heat capacity and glass transition temperature of styrene-methyl methacrylate copolymers / Hidematsu Suzuki*, Yoshiyuki Nishio and Noritaka Kimura and V. B. F. Mathot and M. F. J. Pijpers // Polymer. – 1994. – Vol 35. – P. 3698-3702.