Citation: DONG Yanming, ZHANG Shiying. STUDIES ON CRITICAL CONCENTRATION OF LIQUID CRYSTALLINE ETHYLCELLULOSE*[J]. Chinese Journal of Polymer Science, ;1996, 14(2): 134-141. shu

STUDIES ON CRITICAL CONCENTRATION OF LIQUID CRYSTALLINE ETHYLCELLULOSE*

Received Date: 28 November 1994

Critical concentrations of lyotropic liquid crystalline ethylcellulose in more than tensolvents were determined using both Abbe refractometer and polarized microscopy. Criti-cal concentration Ccrit of forming liquid crystal phase decreased with increasing solubilityparameter δ of solvent until approaching the δ of polymer. Although the alcohols usedas solvents had the same variation rule, the critical concentration values of their solutionswere much higher, due to their excessive large hydrogen bond component of δ.The experiments of using mixes solvents which showed good linear relation between Ccrit and δalso proved this rule.A technique of Transmission Optical Anaysis was first used to estimate the concentration dependence of critical phase transition temperature Tcritof EC,and a T-C phase diagram could be drawn.
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