用户论文(2005)：魔芋葡甘聚糖中乙酰基对其链结构及膜性能的影响

【中文摘要】 采用碱性溶剂对魔芋葡甘聚糖(Kon jac G lucom annan,KGM)进行了脱乙酰处理,采用原子力显微镜、圆二色谱表征了脱乙酰KGM的链结构的变化特点,并对其膜材料的性能进行了测试。结果表明KGM脱乙酰基后,从半柔性直链分子转化成为弹性微球状,特性粘度大大降低,非对称性增加,表明有序结构的形成。上述结构的变化赋予材料性能的提高,KGM脱乙酰后显示了较强的力学性能,膜的拉伸强度、断裂伸长率分别提高了151%、19%,吸湿增重降低53%。 【英文摘要】 Konjac Glucomannan(KGM) was deacetylated in lye solution.The change in the chain structure of deacetylated KGM was characterized by atomic force microscope and circular dichroism spectrum(CD),and the film performance was tested.Results showed that the molecule of deacetylated KGM changed from semi-flexible straight chain into elastic microsphere with greatly reduced inherent viscosity and increased unsymmetry,proving the formation of an ordered structure.Above change in structure improved the performance of...