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高分子研究在实际应用和基础研究方面不断发展,压力对高分子转变行为的影响越来越受到人们的重视.在理论研究方面最成功的处理方法是把自由体积和体系的自由能或状态方程结合在一起,从而定量地推导出不同压力下的临界温度和χ(Flory-Huggins相互作用参数),代表性的结果为Sanchez-Lacombe状态方程和SAFT状态方程;大多数实验结果表明高分子体系的临界温度随压力的增加而升高,即对于在降低温度时发生相分离的UCST高分子混合体系升高压力会降低体系的相容性,而对于LCST体系(高分子混合体系在升高温度时发生相分离)压力能提高高分子体系的相容性.我们最近就压力作用下具有UCST行为的高分子体系实验结果发现,有的体系相分离温度随压力增加而升高,有的体系随压力增加而降低,还有的体系随组成的不同既有升高也有降低的现象,我们根据实验现象结合Sanchez-Lacombe格子流体理论对这一实验现象给出了理论解释.
Polymer research in practical applications and basic research continue to develop, the pressure on the polymer conversion behavior more and more attention by people in the theoretical study of the most successful approach is to free volume and the system of free energy or equation of state (Flory-Huggins interaction parameters) at different pressures are derived quantitatively. The representative results are the Sanchez-Lacombe equation of state and the SAFT equation of state. Most of the experimental results show that the The critical temperature increases with the increase of pressure, that is, the increase of pressure on UCST macromolecule mixture system with phase separation at lower temperature will reduce the compatibility of the system. For the LCST system (polymer hybrid system at elevated temperature The occurrence of phase separation) pressure can improve the compatibility of the polymer system.We have recently under the pressure of UCST behavior of the polymer system experimental results found that some system phase separation temperature increases with increasing pressure, and some systems with pressure Increase and decrease, there are different systems with the composition of both increased and decreased phenomenon, according to the experimental phenomenon combined with Sanchez- Lacombe lattice fluid theory gives a theoretical explanation of this phenomenon.