新型蔗渣木聚糖醋酸酯的合成与表征

Synthesiss and characterization of a novel bagasse xylan acetates

摘要:

摘要：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4h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表征。分别测定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。

Abstract:

Abstract：Bagasse xylan acetates was synthesized by using bagasse xylan as raw materials, acetic anhydride as esterifying agent, p-toluenesulfonic acid(PTSA) as activation catalyst and acetic acid as the solvent. The influence of reaction conditions on the degree of substitution of bagasse xylan acetates was investigated. The degree of substitution of the product was 0.20 under the donditions of m(xylan)∶m(acetic anhydride)=4∶5, m(xylan)∶m(PTSA)=4∶0.2, m(xylan)∶m(acetic acid)=4∶10.49, reaction temperature 70℃, reaction time 4h. The structure was characterizated by FTIR，XRD and SEM. Gelatinization Characteristics and thermal viscosity of Bagasse xylan acetates was separately determined, which indicated that the gelatinization temperature of Bagasse xylan acetates was lower and the stability characteristics of thermal viscosity was significantly improved.