LIGHT-SCATTERING MEASUREMENTS OF ANISOTROPIC VISCOELASTIC COEFFICIENTS OF A MAIN-CHAIN POLYMER NEMATIC LIQUID-CRYSTAL

被引:38
作者
LEE, SD [1 ]
MEYER, RB [1 ]
机构
[1] BRANDEIS UNIV, DEPT PHYS, WALTHAM, MA 02254 USA
基金
美国国家科学基金会;
关键词
D O I
10.1080/02678299008029190
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report the first systematic measurements of elastic coefficients and viscosities that clearly demonstrate the distinction between rigid and semiflexible behaviour of a main-chain polymer nematic liquid crystal, a solution of poly-γ-benzyl glutamate (PBG) in mixed organic solvents. Quasi-elastic Rayleigh scattering studies show a crossover which occurs at a molecular chain length near the persistence length of PBG as the chain length increases. The results are in qualitatively good agreement with recent theoretical predictions for semiflexible chains. It is seen that bending distortions of an individual polymer play an important role in the fundamental nature of nematic elasticity and viscosity. © 1990 Taylor & Francis Group, LLC.
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页码:15 / 29
页数:15
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