木质素的酯化与乙酰化疏水改性  

Hydrophobic modification of lignin-comparison of esterification and acetylation

作　　者：姜晓栋 田宇轩 韩洪晶[1,2] 吴方琰 朱妮妮 王海英 陈彦广[1,2] JIANG Xiaodong;TIAN Yuxuan;HAN Hongjing;WU Fangyan;ZHU Nini;WANG Haiying;CHEN Yanguang(School of Chemistry and Chemical Engineering,Northeast Petroleum University,Daqing 163318,China;Heilongjiang Provincial Key Laboratory of Oil and Gas Chemical Technology,Daqing 163318,China)

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318 [2]黑龙江省石油与天然气化工省重点实验室,黑龙江大庆163318

出　　处：《化工科技》2023年第4期18-23,共6页Science & Technology in Chemical Industry

基　　金：国家自然科学青年基金项目(1908021);中国石油科技创新基金项目(2021DQ02-0701);东北石油大学引导性创新基金项目(2021YDL-03);东北石油大学新能源新领域培育项目(XNYXLY202102);东北石油大学人才引进科研启动经费资助项目(2021KQ07)。

摘　　要：利用十二酰氯与乙酸酐分别对木质素进行了酯化与乙酰化的疏水改性研究,分别对2种改性方法进行了条件优化。采用SEM、FTIR、GPC、TG、WCG进行了表征分析。酯化改性的最佳条件为t=80℃、t=2 h、V(酰氯)=0.5 mL,酯化产率最佳可达到38.85%;乙酰化改性的最佳条件为t=80℃、t=24 h、V(乙酸酐)=6 mL。2种改性方法均会使木质素颗粒及分子量变大,改性比较完全。酯化木质素与乙酰化木质素的水接触角比有机溶剂木质素(68.04°)大,疏水性能提高,最佳条件下分别可达到118.40°和130.87°。热稳定性分析发现2种改性条件下前期热稳定性均有所提高,乙酰化整体的热稳定性最好。The hydrophobic modification of lignin by esterification and acetylation with lauroyl chloride and acetic anhydride was studied,and the conditions of the two modification methods were optimized.Characterization analysis was conducted using SEM,FTIR,GPC,TG,and WCG.The optimal conditions for esterification modification are 80℃,2 h,and 0.5 mL of acyl chloride,with an optimal esterification yield of 38.85%.The optimal conditions for acetylation modification are 80℃,24 h,and 6 mL of acetic anhydride dosage.Both modification methods can increase the particle size and molecular weight of lignin,making the modification more complete.The water contact angle of esterified lignin and acetylated lignin is larger than that of organic solvent lignin(68.04°),and their hydrophobicity is improved.Under optimal conditions,they can reach 118.40°and 130.87°respectively.The analysis of thermal stability found that the initial thermal stability was improved under both modification conditions,and the overall thermal stability of acetylation was the better.

关 键 词：木质素 疏水改性 酯化 乙酰化 

分 类 号：O636.2[理学—高分子化学]