Yamashita Yutaro, Yanagisawa Miho, Tokita Masayuki
Department of Physics, Graduate School of Science, Kyushu University, 744 Motooka, Fukuoka 810-0935, Japan.
Gels. 2018 Mar 22;4(2):26. doi: 10.3390/gels4020026.
The phase diagram and phase transitions of the ternary system of gelatin, water and poly(ethylene glycol) oligomers were studied as a function of the weight fraction of gelatin and the weight fraction and molecular weight of poly(ethylene glycol) oligomers. It was found that both phase separation and the sol-gel transition occur in this ternary system. The relative position of the phase separation line and the sol-gel transition line depends on the weight fraction and the molecular weight of the poly(ethylene glycol) oligomer that coexists in the solution. All aspects of the phase diagram are sensitive to the molecular weight of the poly(ethylene glycol) oligomer. Since the phase separation line crosses the sol-gel transition line in the phase space that is created by the temperature and the weight fraction of gelatin, the phase space is typically divided into four regions, where each region corresponds to a definite phase. The transitions between mutual phases were studied using the light-scattering technique.
研究了明胶、水和聚乙二醇低聚物三元体系的相图及相变，其作为明胶重量分数以及聚乙二醇低聚物重量分数和分子量的函数。结果发现，该三元体系中同时发生相分离和溶胶-凝胶转变。相分离线和溶胶-凝胶转变线的相对位置取决于溶液中共存的聚乙二醇低聚物的重量分数和分子量。相图的所有方面对聚乙二醇低聚物的分子量都很敏感。由于相分离线在由温度和明胶重量分数所构成的相空间中与溶胶-凝胶转变线相交，相空间通常被划分为四个区域，每个区域对应一种确定的相。利用光散射技术研究了相互之间的相转变。
