聚苯乙烯
苯乙烯
玻璃化转变
焓
热力学
无定形固体
材料科学
聚合物
热容
聚合
熵(时间箭头)
高分子化学
产量(工程)
化学
共聚物
有机化学
物理
复合材料
作者
R. W. Warfield,M. C. Petree
出处
期刊:Journal of Polymer Science
[Wiley]
日期:1961-12-01
卷期号:55 (162): 497-505
被引量:42
标识
DOI:10.1002/pol.1961.1205516208
摘要
Abstract A Tarassov function has been used to estimate the specific heat of polystyrene between 0° and 60°K. These data, together with published C p data, have been used to calculate the entropy, enthalpy, and free energy of styrene and polystyrene from 0° to 298.16°K. The entropy of polymerization of styrene at 298.16°K. was found to be 26.69 cal./mole°.The thermodynamic function C p / T versus T as calculated for polystyrene, increases to a maximum at 65°K. and then increases again at the glass transition temperature. The Tarassov function, which is shown to be useful in estimating the specific heat of amorphous polymers, should be combined with a T 3 Debye function to yield more accurate c v data at low temperatures. The number of classically vibrating units per repeating unit of polystyrene was found to be 6.57. The difference C p – C v was calculated at 273°K. and found to be 2.0 cal./mole°.
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