物理化学学报 >> 2005, Vol. 21 >> Issue (08): 909-914.doi: 10.3866/PKU.WHXB20050817

研究论文 上一篇    下一篇

丙三醇水溶液玻璃结构松弛现象学研究

高才; 周国燕   

  1. 中原工学院能源与环境工程系, 郑州 450007; 上海理工大学低温医学与食品冷冻研究所, 上海 200093
  • 收稿日期:2004-12-27 修回日期:2005-03-14 发布日期:2005-08-15
  • 通讯作者: 高才 E-mail:gao_cai@hotmail.com

Phenomenological Study of Structure Relaxation of Glycerol Aqueous Glass

GAO Cai; ZHOU Guo-yan   

  1. Department of Energy & Environment Engineering, Zhongyuan Institute of Technology, Zhengzhou 450007;
  • Received:2004-12-27 Revised:2005-03-14 Published:2005-08-15
  • Contact: GAO Cai E-mail:gao_cai@hotmail.com

摘要: 为了考察水含量对丙三醇水溶液玻璃体结构松弛行为的影响,利用差示扫描量热法(DSC)测量了五种高浓度丙三醇水溶液的玻璃化转变温度和玻璃化转变区域的比热容,利用TNM模型进行了结构松弛的现象学分析. 松弛时间的分析结果表明,水溶液玻璃中水含量越高,则松弛过程越快. TNM模型的计算结果表明,随着水含量的增加,玻璃体系的结构松弛活化能和非指数参数都有逐渐降低的趋势,而非线性参数和指前因子逐渐增加.

关键词: 结构松弛, 丙三醇, 水溶液, 差示扫描量热法

Abstract: In order to examine the effects of water contents on structure relaxation parameters of glycerol aqueous glasses, heat capacity and glass transition temperature of five aqueous solutions (60%, 70%, 80%, 90%, and 100%) were determined using the differential scanning calorimetry (DSC). Structure relaxation behaviors of glycerol aqueous glasses were investigated in the term of Tool-Narayanaswamy-Monihan (TNM) model parameters. The structure relaxation time was found to decrease as the water content increased. Curve-fitting results indicated that the apparent activation energy and non-exponential parameter decreased while non-linear parameter and pre-exponential parameter increased as the water content increased.

Key words: Structure relaxation, Glycerol, Aqueous solutions, Differential scanning calorimetry (DSC)