The Contribution of Water to the Specific Heat Change at the Glass‐to‐Rubber Transition of the Ternary System BSA‐Water‐NaCl
The Contribution of Water to the Specific Heat Change at the Glass‐to‐Rubber Transition of the Ternary System BSA‐Water‐NaCl
复制标题
水对三元体系 BSA-水-NaCl 玻璃到橡胶转变时比热变化的贡献
DOI：
10.1111/j.1365-2621.2000.tb10263.x
复制
发表时间：
2000
影响因子：
3.9
通讯作者：
M. Ishikawa
中科院分区：
文献类型：
--
作者：
C. Inoue;M. Ishikawa
利用DSC研究了bsa -水- nacl体系从玻璃到橡胶的转变过程。在1:9 ~ 6:4 NaCl:BSA范围内，T = 178 ~ 187 K，随NaCl含量的增加而降低。NaCl:BSA的重量比从1:9增加到5:5，t2时的比热变（ΔC g1, J/(g BSA)K）和计算的未冻水（UFW）的变化也随之增加。UFW也与玻璃区NaCl用量相关，相关系数约为。6 (mol h3o)/(mol NaCl)，与Na +的水化数相当，说明UFW对bsa -水体系的ΔC g at T g有一定的促进作用。
We studied the glass-to-rubber transition of a BSA-water-NaCl system using DSC. The T g was 178-187 K and decreased with increasing NaCl content from 1:9 to 6:4 NaCl:BSA. The specific heat change (ΔC g 1 , J/((g BSA)K)) at T 2 increased as the weight ratio increased from 1:9 to 5:5 NaCl:BSA, as did the change in calculated unfrozen water (UFW). The UFW was also correlated with the amount of NaCl in the glassy region with a correlation coefficient of approx. 6 (mol H 3 O)/(mol NaCl), which is comparable to the hydration number of Na + , These results suggest that UFW could contribute to the ΔC g at T g of the BSA-water system.