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The Relationship between Glass Transition Temperature and Composition in Polymer Solution Systems

GUAN Lan,HUANG Ding-hai~*,SHENG Jing(School of Material Science & Engineering,Tianjin University,Tianjin 300072,China)  
Many literatures have reported the relationship between glass transition temperature and composition in polymer solutions.These equations are mostly based on classical thermodynamic theory,free volume theory,and the results derived from these equations are fit well in some polymer solution systems.In the curve of T_g vs.composition,anomalous "cusp" and double T_gs have been observed in some polymer-solvent systems,and these anomaly could be explained through free volume theory and self-concentration theory qualitatively,but the experimental results were quite different from the results derived from the equations,and these theories failed in some polymer solutions.So in order to account for and expect the occurrence of anomalous phenomena,general theories are needed to develop the relationship between T_g and composition and explain the "cusp".
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