化学学报 ›› 2001, Vol. 59 ›› Issue (11): 1888-1893. 上一篇    下一篇

研究论文

非离子表面活性剂液晶的线性粘弹性研究

王红霞;张高勇   

  1. 武汉大学化学与环境科学学院;中国日用化学工业研究所国家表面活性剂工程研 究中心
  • 发布日期:2001-11-15

Studyies of linear viscoelasticity of liquid crystal of a nonionic surfactant

Wang Hongxia;Zhang Gaoyong   

  • Published:2001-11-15

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。

关键词: 非离子表面活性剂, 液晶, 相图, 粘弹性, 聚氧乙烯醚, 二维核磁共振, 偏光显微镜

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.

Key words: NON IONIC SURFACTANTS, LIQUID CRYSTAL, PHASE DIAGRAM, VISCOELASTICITY, POLYETHENOXY ETHER, POLARIZING MICROSCOPES

中图分类号: