细菌纤维素乙酰化改性研究

以细菌纤维素为原料,浓硫酸为催化剂,与醋酸酐进行乙酰化反应,制得醋酸细菌纤维素(BCA),讨论了反应温度、反应时间、固液比、催化剂的用量对合成BCA的影响。结果表明:细菌纤维素的羟基被乙酰基取代。适宜的反应条件为反应温度70℃,反应时间2.5 h,细菌纤维素为1.0 g时,醋酸酐用量为20mL,催化剂浓硫酸用量为0.1 mL,BCA产率可达98%以上,取代度达2.9以上。

Acetylation modification of bacterial cellulose

Bacterial cellulose and acetic anhydride were acetylated with concentrated sulfuric acid as catalyst to produce acid bacterial cellulose(BCA).The effects of reaction temperature and time,solid-liquid ratio and catalyst amount on the synthesis of BCA were discussed.The results showed that acetyl group was substituted for hydroxyl group in bacterial cellulose.The BCA output can be above 98% and the substitution degree above 2.9 when the reaction conditions were optimized as followed: reaction temperature 70℃ and time 2.5 h,20 mL acetic anhydride in 1.0 g bacterial cellulose and catalyst amount 0.1 mL.