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氰乙基纤维素/二甲基甲酰胺溶液在高分子浓度达到一定值C_1~*时,可以形成液晶态。随浓度的增加,各向同性溶液经过一个两相共存区而转变成为完全各向异性的体系。通过观察溶液的双折射,测定溶液的折射率和消光度,确定出了溶液的临界浓度C_1~*和C_2~*。并用观察溶液双折射的方法测定了不同浓度下溶液的相转变温度Tc,得到了该溶液的T—C相图。讨论了在该体系中液晶态的形成过程。
Cyanoethyl cellulose / dimethyl formamide solution in the polymer concentration reaches a certain value C_1 ~ *, the liquid crystal state can be formed. As the concentration increases, the isotropic solution transforms into a perfectly anisotropic system through a two-phase coexistence zone. By observing the birefringence of the solution and measuring the refractive index and extinction degree of the solution, the critical concentrations C_1 ~ * and C_2 ~ * of the solution were determined. The phase transition temperature (Tc) of the solution at different concentrations was measured by the method of observing the birefringence of the solution. The T-C phase diagram of the solution was obtained. The formation of liquid crystal states in this system is discussed.