Universal response of polymers, solvents, and solutions to pressure
Universal response of polymers, solvents, and solutions to pressure
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DOI：
10.1021/ma00068a025
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发表时间：
1993-08
期刊：
影响因子：
5.5
通讯作者：
I. Sanchez;Junhan Cho;W. J. Chen
中科院分区：
文献类型：
--
作者：
I. Sanchez;Junhan Cho;W. J. Chen
结果表明，聚合物、溶剂和聚合物溶液对静水压力的压缩响应满足对应态原理。一个无量纲的压力变量被用来叠加压缩数据作为温度的函数到一个通用的曲线。一个严格的热力学分析发展到等温压缩的自由能。作为密度函数的自由能的曲率，特别是其最小值附近的非谐性，决定了压缩响应。能量曲率对温度的明显独立性，在某些情况下，成分，是观察到的普适性的原因。对于许多聚合物，压缩响应对化学结构也相对不敏感
It is demonstrated that the compression response of polymers, solvents, and polymer solutions to hydrostatic pressure satisfies a corresponding states principle. A dimensionless pressure variable is used to superpose compression data as a function of temperature into a universal curve. A rigorous thermodynamic analysis is developed to relate isothermal compression to the free energy. The curvature of the free energy as a function of density, in particular its anharmonicity around its minimum, governs the compression response. The apparent independence of the energy curvature to temperature, and in some cases composition, is responsible for the observed universality. The compression response is also relatively insensitive to chemical structure for many polymers