非离子表面活性剂液晶的线性粘弹性研究

用偏光显微镜测定了十二/十四烷基聚氧乙烯醚(C12～14EO7)/水二元体系相图的液晶区，用RS-75控制应力流变仪，在固定频率(f=0.0316Hz)时，对不同样品进行应力扫描。利用线性粘弹性区内流变参数G"与G'的比值thδ对相转变敏感的特点来确定相结构的转变，并将结果与2^HNMR结果相比较，两者吻合，这表明宏观测量手段能够反映微观相结构的变化规律。对于液晶实验结果采用弹簧-粘壶模型进行解释和讨论。

Studyies of linear viscoelasticity of liquid crystal of a nonionic surfactant

The liquid crystal zone for a nonionic surfactant (C12～ 14EO7) /water system was determined by using polarized light microscope. The stress sweep curves were tested (frequency= 0.0316 Hz) for several samples with RS-75 rheostress meter. The ratio of loss modulus (G") and storage modulus (G'), i.e. thδ, was quite sensitive to the change of microstructure caused by a phase transition in linear viscoelasticity range. This property could be used to define the phase transition. The results of rheology were consistent with those of 2^H NMR. The data of the macro-rheologyical measurements reflected the rules of microstructure during the phase transition. The test results could be explained by the spring and dashpot model used in liquid crystal structure.