Citation: CHEN Ze-Ming, BI Dong-Yang, WANG Li-Min. Enthalpy and Dielectric Relaxations of Triacetin in the Vicinity of Glass Transition[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB201206061 shu

Enthalpy and Dielectric Relaxations of Triacetin in the Vicinity of Glass Transition

1.
State Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China

Received Date: 17 April 2012
Available Online: 6 June 2012
Fund Project: 国家自然科学基金(51071138) (51071138) 河北省自然科学基金(A2010002048) (A2010002048)燕山大学优秀博士生科学基金(YSUSF201102)资助项目 (YSUSF201102)

To understand the experimental observation that the dynamic parameters determined for enthalpy and dielectric relaxation might differ in fragile glass-forming molecular liquids, a fragile molecular liquid, triacetin, was chosen for the study of the two relaxation dynamics. The non-Arrhenius and nonexponential characters were focused, and the kinetic fragility and non-exponential parameter determined from the two relaxation measurements were found to be remarkably similar. Experimental results indicate that the degree of correlation in the molecular motions involved in the two relaxations depends on molecular flexibility. The dependence of the dynamic parameters on molecular structures in the glass forming liquids is discussed.
- Glass Transition,
- Supercooled Liquid,
- Structural Relaxation,
- Enthalpy Relaxation,
- Dielectric Relaxation
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