三乙酸甘油酯玻璃化转变的焓弛豫与介电弛豫研究

引用本文: 陈泽明, 毕东阳, 王利民. 三乙酸甘油酯玻璃化转变的焓弛豫与介电弛豫研究[J]. 物理化学学报, doi: 10.3866/PKU.WHXB201206061 shu

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

三乙酸甘油酯玻璃化转变的焓弛豫与介电弛豫研究

基金项目:
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)

摘要:

脆性较高的玻璃形成分子液体通常在焓弛豫和介电弛豫动力学上表现出明显的差异性, 为了深入理解这一问题, 本文针对具有较高液体脆性的三乙酸甘油酯对比研究了焓弛豫与介电弛豫行为. 利用这两个技术分别研究了结构弛豫动力学过程的非Arrhenius 与非指数特征, 液体脆性因子与非指数性因子的对比显示很好的一致性. 分析表明分子的柔性有可能对这两种弛豫过程中分子运动的相关性产生明显的影响. 讨论了玻璃形成液体的分子结构与动力学参数之间的关联.

关键词:

English

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: 02 August 2012
Fund Project:
国家自然科学基金(51071138)

河北省自然科学基金(A2010002048)

燕山大学优秀博士生科学基金(YSUSF201102)资助项目

Abstract:

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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

三乙酸甘油酯玻璃化转变的焓弛豫与介电弛豫研究

English

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

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

三乙酸甘油酯玻璃化转变的焓弛豫与介电弛豫研究

English

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

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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