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以蔗渣木聚糖为原料,醋酸酐为酯化剂,对甲基苯磺酸为催化剂,在冰醋酸体系中合成了蔗渣木聚糖醋酸酯。考察了诸因素对产品取代度的影响。在m(木聚糖)∶m(醋酸酐)=4∶5,m(木聚糖)∶m(催化剂)=4∶0.2,m(木聚糖)∶m(冰醋酸)=4∶10.49,酯化温度为70℃,酯化时间为4 h的条件下,合成了取代度为0.20的蔗渣木聚糖醋酸酯。采用FTIR、XRD和SEM对蔗渣木聚糖醋酸酯结构进行了表征。分别测定了蔗渣木聚糖醋酸酯的糊化性能和热黏度,表明蔗渣木聚糖醋酸酯比蔗渣木聚糖糊化温度低,热黏稳定性显著改善。
Using bagasse xylan as raw material, acetic anhydride as esterification agent and p-methylbenzenesulfonic acid as catalyst, bagasse xanthan acetate was synthesized in glacial acetic acid system. The effects of various factors on product substitution degree were investigated. In m (xylan): m (acetic anhydride) = 4: 5, m (xylans): m (catalyst) = 4: 0.2, m , Esterification temperature of 70 ℃, esterification time of 4 h under the conditions of the synthesis degree of 0.20 bagasse xylan acetate. The structure of bagasse xylan acetate was characterized by FTIR, XRD and SEM. The gelatinization properties and hot viscosity of bagasse xylan acetate were measured respectively, which indicated that the gelatinization temperature of bagasse xylan acetate was lower than that of bagasse xylan, and the thermal-viscidity stability was significantly improved.