转酯化法制备芦苇基醋酸纤维素的工艺研究

Study of the Process of Preparing Reedyl Cellulose Acetate by Transesterification

以芦苇纤维素为原材料,在以1,8-二氮杂二环十一碳-7-烯(DBU)为催化剂,醋酸异丙烯酯(IPA)或乙酸乙烯酯(VA)为乙酰化试剂,二甲基亚砜(DMSO)为溶剂的条件下,对芦苇纤维素进行转酯化反应制备芦苇基醋酸纤维素。探讨了不同试验条件对芦苇基醋酸纤维素聚合度及取代度的影响,并通过聚合度测定、酸碱滴定取代度测定及红外光谱分析等手段进行表征。结果表明,在以IPA作为乙酰化试剂,DMSO作为溶剂,DBU作为催化剂,反应时间为4.5 h,反应温度为110℃时所制备的芦苇基醋酸纤维素最佳;所制芦苇基二醋酸纤维素的聚合度可达483.63,取代度可达2.41。

Reed cellulose was used as raw material,and reedyl cellulose was prepared by transesterification reaction under the conditions of 1,8-diazadicycloundecanocarbon-7-ene(DBU)as catalyst,isopropylene acetate(IPA)or vinyl acetate(VA)as acetylation reagent,and dimethyl sulfoxide(DMSO)as solvent.The effects of different experimental conditions on the degree of polymerization and degree of substitution of reedyl cellulose acetate were discussed,which were characterized by polymerization measurement,acid-base titration measurement and infrared spectroscopy analysis.Finally,it was found that the best reed-based cellulose acetate was prepared when IPA was used as acetylation reagent,DMSO as solvent and DBU as catalyst,the reaction time was 4.5 h,and the reaction temperature was 110℃.The degree of polymerization of the prepared reed-based cellulose diacetate can reach 483.63,and the degree of substitution can reach 2.41.