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Glass Transition and Structure Relaxation Parameters of Glycerol/Water Mixtures with High Concentrations: A DSC Study
Gao Cai,Zhou Guoyan,Xu Yi,Hu Tongji,Hua Zezhao*
Author NameAffiliationE-mail
Gao Cai Institute of Cryomedicine and Food Refrigeration, Shanghai University for Science and Technology, Shanghai 200093  
Zhou Guoyan Institute of Cryomedicine and Food Refrigeration, Shanghai University for Science and Technology, Shanghai 200093  
Xu Yi Institute of Cryomedicine and Food Refrigeration, Shanghai University for Science and Technology, Shanghai 200093  
Hu Tongji Institute of Cryomedicine and Food Refrigeration, Shanghai University for Science and Technology, Shanghai 200093  
Hua Zezhao* Institute of Cryomedicine and Food Refrigeration, Shanghai University for Science and Technology, Shanghai 200093 tchua@sh163.net  
Abstract:
In order to examine the effects of water contents and heating/cooling rates on the glass transition and the structure relaxation parameters of glycerol/water mixtures, five aqueous solutions (60%, 70%, 80%, 90% and 100%) were investigated using the differential scanning calorimetry. Four scanning rates (10, 15, 20, 25 K/min) were used to obtain the glass transition parameters. The fitting results of plasticization constants indicated that Gordon-Taylor relationship could not be used effectively without considering scanning rates and that point on calorimetric step was chosen as the glass transition temperature. The specific heat changes during glass transition processes were relative not only to water content but also to heating rates. With the increasing of water contents in glycerol aqueous solutions, the structure relaxation activation energies and dynamic fragilities were decreased. Since the thermodynamic fragilities were increased with the increasing of water content, so the dynamic fragility and thermodynamic fragility were changed inversely if the water contents were changed in glycerol/water mixtures.
Key words:  Glass transition, Glycerol, DSC, Plasticization constant, Specific heat, Activation energy, Fragility
FundProject:
丙三醇浓溶液玻璃化转变与结构松弛参数DSC分析
高才,周国燕,胥义,胡桐记,华泽钊*
摘要:
利用差示扫描量热仪研究了5种高浓度丙三醇水溶液(60%、 70%、 80%、 90%、 100%)的玻璃化转变行为,以考察水分含量和升降温速率对其玻璃化转变行为和结构松弛参数的影响.采用4种线性升降温速率(10、 15、 20、 25 K/min)获得玻璃化转变的相关参数.利用Gordon-Taylor方程对玻璃化转变温度的分析结果表明,水对丙三醇增塑常数的计算结果与升降温速率和玻璃化转变温度的读取方法有很大关系.玻璃化转变过程的比热容变化不仅随水分含量的增加而增加,而且与升降温速率也有一定的依赖关系.结
关键词:  玻璃化转变  丙三醇  差示扫描量热法  增塑常数  热容  松弛活化能  脆度
DOI:10.1088/1674-0068/18/3/457-462
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