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Unique evolution of spatial and dynamic heterogeneities on the glass transition behavior of PVPh/PEO blends

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Abstract

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 (T g) and activity energy (E a) 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.

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Authors and Affiliations

  1. Key Laboratory of Functional Polymer Materials, Ministry of Education, College of Chemistry, Nankai University, Tianjin, 300071, China

    Yue-long Hou, Qiang Wu, Tie-hong Chen & Ping-chuan Sun  (孙平川)

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  1. Yue-long Hou
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  2. Qiang Wu
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  3. Tie-hong Chen
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  4. Ping-chuan Sun  (孙平川)
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Corresponding author

Correspondence to Ping-chuan Sun  (孙平川).

Additional information

The work was financially 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), and the National Basic Research Program of China (973 Program, 2012CB821500).

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Hou, Yl., Wu, Q., Chen, Th. et al. Unique evolution of spatial and dynamic heterogeneities on the glass transition behavior of PVPh/PEO blends. Chin J Polym Sci 30, 900–915 (2012). https://doi.org/10.1007/s10118-012-1182-7

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  • DOI: https://doi.org/10.1007/s10118-012-1182-7

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