Phase Equilibria, Morphologies of Microphase Separation, and Interfacial Structures of Polymer Systems Studied by Equations of State

摘要

Polymer blends or copolymers have multiscale complex structures that can be used as templates to prepare various complex materials. To regulate the mesoscale structures of these polymer blends or copolymers, there are three fundamental problems: What is the physical condition of the microphase separation needed to form materials with desired compositions and mesoscale structures in different domains? How do these compositions and mesoscale structures evolve during the preparation period? How does the morphology change in the interfacial region? Many experimental measurements, computer simulation methods, and theories have been developed. However, most of them are only suitable for individual tasks. In recent years, we have developed theoretical methods based on equations of state that can be used comprehensively to study the multiscale structure of polymer systems, including the phase diagrams, the morphologies and evolution of microphase separation, the densities and composition profiles in different domains, and the molecular configurations in the interfacial region. The molecular parameters of the equation of state or the Helmholtz function model can be determined from the pressure, volume, temperature, and miscibility data of polymers, which ensures the practical applicability of the methods.