Demonstration of correlation between Debye-Stokes-Einstein breakdown and dynamics characteristics of polymer near the glass transition temperature
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초록
내용
Due to the wide range of practical applications, the translational diffusion of small molecules in polymers has been the subject of extensive research for many years. Although Debye-Stokes-Einstein (DSE) relationship well describes the rotation and translation of small molecules in polymers far above the glass transition temperature, the violation in which translational motion is apparently enhanced over rotational motion, has been observed in polymers near the glass transition temperature. Here, we measure the translational and rotational diffusion of fluorescent probes of different sizes in several polymers to investigate the breakdown of the DSE relationship by Imaging Fluorescence Correlation Microscopy. The results show that the magnitude of the DSE breakdown is strongly correlated with the dynamic heterogeneity and temperature dependence of dynamics of the system, which are important dynamics characteristics of polymer near the glass transition.