This paper presents experimental results on the effect of alkalis such as NaOH,KOH and Ca(OH) 2 on deacetylation of a konjac glucomannan(KGM) powder under mechano-chemical(MC) treatment. The results show that the alka...This paper presents experimental results on the effect of alkalis such as NaOH,KOH and Ca(OH) 2 on deacetylation of a konjac glucomannan(KGM) powder under mechano-chemical(MC) treatment. The results show that the alkalinity of modiers is a dominant factor for deacetylation of KGM. In addition,characteristics,such as swelling property,viscous stability and thermal behavior of the deacetylated KGM are analyzed.展开更多
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...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%。展开更多
文摘This paper presents experimental results on the effect of alkalis such as NaOH,KOH and Ca(OH) 2 on deacetylation of a konjac glucomannan(KGM) powder under mechano-chemical(MC) treatment. The results show that the alkalinity of modiers is a dominant factor for deacetylation of KGM. In addition,characteristics,such as swelling property,viscous stability and thermal behavior of the deacetylated KGM are analyzed.
文摘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%。