UNIQUE EVOLUTION OF SPATIAL AND DYNAMIC HETEROGENEITIES ON THE GLASS TRANSITION BEHAVIOR OF PVPh/PEO BLENDS  

作　　者：孙平川 

机构地区：[1]Key Laboratory of Functional Polymer Materials,Ministry of Education,College of Chemistry,Nankai University

出　　处：《Chinese Journal of Polymer Science》2012年第6期900-915,共16页高分子科学（英文版）

基　　金：supported by the National Natural Science Fund for Distinguished Young Scholars (No.20825416);the National Natural Science Foundation of China(NSFC) through the General Programs(No.20774054);the National Basic Research Program of China(973 Program,2012CB821500)

摘　　要：Glass transition behavior of hydrogen bonded polymer blends of poly（vinyl phenol） （PVPh） and poly（ethylene oxide） （PEO） is systematically investigated using normal differential scanning calorimetry （DSC） and recently developed multifrequency temperature-modulated DSC （TOPEM）, in combination with Fourier transform infrared spectroscopy （FTIR） and nuclear magnetic resonance （NMR） techniques, focusing on the effect of the PEO molecular weight on the spatial and dynamic heterogeneity. It is found, for the first time, that both the glass transition temperature （Tg） and activity energy （Ea） of the blends strongly depend on PEO molecular weight, and a common turning point, which separates the rapid and slow increasing regions, can be found. The interchain hydrogen bonding interactions, both determined by FTIR measurements and obtained from the Kwei equation, decrease with increasing PEO molecular weight, indicating a decrease of the componential miscibility. A series of parameters related to the microscopic spatial and dynamic heterogeneity, such as the activity energy, fragility, nonexponential factor and the size of cooperatively rearranging regions, are calculated from frequency dependency complex heat capacity measured using TOPEM. It is found that each of these parameters monotonically changes with increasing the PEO molecular weight during the glass transition process, demonstrating that hydrogen bonding interaction is the key factor in controlling the spatial and dynamic heterogeneity, thus the glass transition. NMR relaxation results reveal the existence of obvious phase separation large than 5 nm, implying that the cooperatively rearranging regions should be closely related to the interphase region between the two components. The above obtained origin and evolution of spatial and dynamic heterogeneity provide a new insight into the glass transition behavior of polymer blends.Glass transition behavior of hydrogen bonded polymer blends of poly（vinyl phenol） （PVPh） and poly（ethylene oxide） （PEO） is systematically investigated using normal differential scanning calorimetry （DSC） and recently developed multifrequency temperature-modulated DSC （TOPEM）, in combination with Fourier transform infrared spectroscopy （FTIR） and nuclear magnetic resonance （NMR） techniques, focusing on the effect of the PEO molecular weight on the spatial and dynamic heterogeneity. It is found, for the first time, that both the glass transition temperature （Tg） and activity energy （Ea） of the blends strongly depend on PEO molecular weight, and a common turning point, which separates the rapid and slow increasing regions, can be found. The interchain hydrogen bonding interactions, both determined by FTIR measurements and obtained from the Kwei equation, decrease with increasing PEO molecular weight, indicating a decrease of the componential miscibility. A series of parameters related to the microscopic spatial and dynamic heterogeneity, such as the activity energy, fragility, nonexponential factor and the size of cooperatively rearranging regions, are calculated from frequency dependency complex heat capacity measured using TOPEM. It is found that each of these parameters monotonically changes with increasing the PEO molecular weight during the glass transition process, demonstrating that hydrogen bonding interaction is the key factor in controlling the spatial and dynamic heterogeneity, thus the glass transition. NMR relaxation results reveal the existence of obvious phase separation large than 5 nm, implying that the cooperatively rearranging regions should be closely related to the interphase region between the two components. The above obtained origin and evolution of spatial and dynamic heterogeneity provide a new insight into the glass transition behavior of polymer blends.

关 键 词：Glass transition Polymer blend DSC FTIR Solid-state NMR. 

分 类 号：O631.2[理学—高分子化学]