壳聚糖溶致液晶性的研究  

Studies on Lyotropic Liquid Crystalline Property of Chitosan

作　　者：夏科[1] 蔡继业[1] 王彬[1] 马豫峰[1] 

机构地区：[1]暨南大学生命科学技术学院,广东广州510632

出　　处：《无锡轻工大学学报（食品与生物技术）》2003年第3期36-40,共5页Journal of Wuxi University of Light Industry

基　　金：广东省自然科学基金项目(编号:990483);广东省高等教育厅重点实验室及教育部科技重点基金项目(编号:00124)资助课题.

摘　　要：将壳聚糖溶于体积分数36%的乙酸溶液中浇涛制膜,在干燥下壳聚糖质量分数达到一定的临界质量分数形成溶致液晶.利用FTIR仪、原子力显微镜和X 射线衍射仪为表征手段,研究了壳聚糖溶致液晶相转变过程中分子间的相互作用以及液晶相微观结构的变化.结果表明,在该薄膜中有被冻结的液晶滴状结构,随着溶剂的挥发,膜体系内氢键的种类和数目发生改变,壳聚糖胶束颗粒聚集成圆盘或六角状,体现为同心环堆积,一定时间后转变为立方环状结构.这种液晶结构是壳聚糖胶束颗粒在分子间的相互作用下形成的自组装构型,是一种非平衡状态下的耗散结构.In order to study the refined structure of lyotropic liquid crystal of chitosan and the changes of its structure, the structure of solution casting films of chitosan was determined by AFM,FTIR,XRD. Films with liquid crystalline texture can be prepared from diluted solutions containing 36% of acetic acid in which concentration of chitosan was lower than the critical concentration of liquid crystal(6%). The micelle granules were accumulated in the guttate structure. Both liquid crystal phase and isotropic phase coexisted here. With the volatilization of solvent, the structures can change from disc or hexagon to cube with the variation of environment and interior reciprocity. The shape of disc or hexagon is the midphase in the progress of changes. It is the result of selfassembly of molecules and embodiment of dissipative structure under the imbalance state.

关 键 词：壳聚糖 溶致液晶 原子力显微镜 耗散结构 液晶结构 薄膜 

分 类 号：O636[理学—高分子化学] Q539[理学—化学]