THE THERMODYNAMICS OF MIXING OF POLYSTYRENE AND POLY(ALPHA-METHYLSTYRENE) FROM A CALORIMETRIC VIEWPOINT

被引:7
作者
BRUNACCI, A
PEDEMONTE, E
COWIE, JMG
MCEWEN, IJ
机构
[1] HERIOT WATT UNIV,DEPT CHEM,EDINBURGH EH14 4AS,MIDLOTHIAN,SCOTLAND
[2] UNIV GENOA,INST CHIM IND,I-16146 GENOA,ITALY
关键词
HEAT OF MIXING; CALORIMETRY; POLYSTYRENE;
D O I
10.1016/0032-3861(94)90326-3
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The enthalpy of mixing (DELTA(M)H) for polystyrene with poly(alpha-methylstyrene) has been estimated by a semidirect calorimetric method. This involved measuring heats of solution of blends and of mechanical mixtures having the same composition to obtain, by difference, the heat of mixing of the two polymers in their glassy states. By assuming a model for the relaxation of a glass to its corresponding hypothetical liquid state, these were then converted to give a DELTA(M)H value for the liquid polymers. A small negative value for the heat of mixing was obtained over part of the composition range, contrary to expectations.
引用
收藏
页码:2893 / 2896
页数:4
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