Glass transition and mixing thermodynamics of a binary eutectic system
Literature Information
Wenkang Tu, Zeming Chen, Zijing Li, Yaqi Zhang, Riping Liu, Yongjun Tian, Li-Min Wang
A quantitative evaluation of the contribution of mixing thermodynamics to glass transition is performed for a binary eutectic benzil and m-nitroaniline system. The microcalorimetric measurements of the enthalpy of mixing give small and positive values, typically ∼200 J mol−1 for the equimolar mixture. The composition dependence of the glass transition temperature, Tg, is found to show a large and negative deviation from the ideal mixing rule. The Gordon–Taylor and Couchman–Karasz models are subsequently applied to interpret the Tg behavior, however, only a small fraction of the deviation is explained. The analyses of the experimental results manifest quantitatively the importance of the mixing thermodynamics in the glass transition in miscible systems.
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