新的液晶性壳聚糖衍生物——氰乙基壳聚糖的合成与表征

Synthesis and Characterization of a New Chitosan Derivatives with Liquid Crystalline Behavior O Cynaoethylchitosan

甲壳素是自然界蕴藏量最丰富的天然高分子化合物之一，但人们对它的了解却远不如纤维素和淀粉．仅就液晶领域而言，纤维素衍生物的液晶性早已为人们所认识［１］，例如氰乙基纤维素的液晶性已有很多研究［２，３］，但已报道的有液晶性的甲壳素衍生物却只有壳聚糖羟丙基壳...

O cyanoethylchitosan was prepared at room temperature using sodium hydroxide as catalyst. Solubility of O cyanoethylchitosan was prior to chitosan. While it dissolved, O cyanoethylchitosan formed typical cholesteric liquid crystalline texturefingerprint texture. The fingerprint texture can be frozen in films casted from 5% aqueous acetic acid solution. The droplet texture of positive birefriengence can also be observed in these films. Critical concentrations of cyanoethylchitosan in four acidic solvents were determined using polarized microscopy. All critical concentration values were in the range of 19%～20%(volume fraction), independing of the acidity of solvents.