常用醇类低温保护剂水溶液的DSC研究  

Thermal property of polyalcohols aqueous solutio nused as cryoprotectants studied by DSC

作　　者：胡桐记[1] 高才[1] 周国燕[1] 胥义[1] 华泽钊[1] 

机构地区：[1]上海理工大学低温医学与食品冷冻研究所,上海200093

出　　处：《低温工程》2005年第1期38-43,共6页Cryogenics

基　　金：国家自然科学基金(50376040; 50206013);上海市教委重点学科;上海市教委青年基金(02GQ25)资助。

摘　　要：利用差示扫描量热仪(Pyris DiamondDSC),研究了乙二醇、丙三醇、1, 3丙二醇、1, 3丁二醇和 2, 3丁二醇水溶液的过冷行为、水合性质以及玻璃化转变温度,得出了这些性质与溶液浓度的关系。过冷度和未冻水含量在低浓度时没有明显的规律性;而在中高浓度则具有相同的变化规律:随着溶液浓度的增大而增大。各低温保护剂在水合性质上所表现出的差异性,体现了保护剂的官能团 (羟基、甲基 )所起到的重要作用。保护剂在玻璃化转变温度的明显差异,则反映它们在玻璃化能力方面的强与弱。To examine possible relations between freezing properties and the number of hydroxyl groups in solute molecules, a differential scanning calorimeter was employed to study the thermal behaviors of polyalcohols aqueous solution, such as supercooling degree of heterogeneous nucleating temperature, hydration properties, glass transition. Experimental results showed that at the low concentrations supercooling and hydration behaviors have no regularity. However, at the high concentrations, they all accrete as the concentrations augment. The different properties of cryoprotectants showed in hydration exhibit the important effects in aqueous properties behaved by molecular structure, such as methyl groups and hydroxyl groups. The distinctiveness in glass transition temperature of five polyalcohols reflects the feebleness and power in the aspects of glass transition ability.

关 键 词：线性多元醇 差示扫描量热法 过冷度 水合性质 玻璃化 

分 类 号：TQ223.16[化学工程—有机化工]