低温保护剂溶液固化性质的DSC研究

利用差示扫描量热仪,研究了乙二醇、丙三醇、1,3丙二醇、1,3丁二醇和2,3丁二醇水溶液的水合性质、玻璃化转变温度和反玻璃化转变温度,得出了这些性质与溶液浓度的关系.研究发现未冻水含量在低浓度时没有明显的规律性,而在中高浓度则随着溶液浓度的增大而增大.对于玻璃化转变,中低浓度区溶液形成的是部分晶体的玻璃态,紧接着在高浓度区溶液形成完全的玻璃态.部分玻璃化的温度不随浓度变化,而玻璃化的温度随浓度增大而升高.形成反玻璃化的浓度范围比较小,反玻璃化的温度随浓度增大而升高.保护剂在玻璃化转变温度和反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.

Solidification Properties of Polyalcohols Aqueous Solution Studied by DSC

In order to examine possible relations between freezing properties and the number of hydroxyl groups in solute molecules, a differential scanning calorimeter (Pyris- Diamond DSC) was employed to study the thermal behaviors of polyalcohols aqueous, such as hydration properties, glass transition, and devitrification. The experimental results show that at the low concentrations hydration behaviors have no disciplinarians. However, at the high concentrations, they accreted as the concentrations increase. At the middle and low concentration, the aqueous solutions formed partially amorphous glassy state. The temperature of partially glass transition did not change with solution concentration. But, at the high concentration, the aqueous solutions formed completely amorphous glassy state and the temperature of glass transition increased with concentration. The distinct otherness in glass transition and devitrification temperature of five polyalcohols reflected the feebleness and power in the aspects of glass transition ability.