壳聚糖的液晶行为研究

Studies on Liquid Crystalline Behavior of Chitosan

用偏光显微术、平均折射率法和富立叶红外光谱法研究了壳聚糖的溶致液晶行为。在二氯乙酸、甲酸、丙烯酸和３６％乙酸等溶剂中测得的临界浓度都是８％（体积比）或４％～６％（重量比），与根据Ｆｌｏｒｙ理论得到的计算值相符。低的临界浓度值表明壳聚糖的链刚性比纤维素的大。

The lyotropic liquid crystalline behavior of a natural macromolecule-chitosan was studied using polarized microscopy,average refractive index method and FTIR.The critical concentrations of chitosan in solvents of dichloroacetic acid,formic acid,acrylic acid and 36% acetic acid were all 8% (percentage by volume) or 4%～6%(percentage by weight).These experimental values are consistent with the calculated value deduced according to Flory theory.These low critical concentration values also imply that the chain rigidity of chitosan is larger than that of cellulosic chain.