Effects Of Sequence Length Distribution On Heat-Capacity And Glass-Transition Temperature Of Styrene-Methyl Methacrylate Copolymers
POLYMER(1994)
摘要
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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关键词
HEAT CAPACITY, ALTERNATING COPOLYMER, SEQUENCE LENGTH DISTRIBUTION
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