罗布麻杆提取木质素的气凝胶性能  

Properties of aerogel with lignin extracted from Apocynum stems

作　　者：刘瑞[1] 陈英 周亲雄[1] 欧阳宇航 LIU Rui;CHEN Ying;ZHOU Qinxiong;OUYANG Yuhang(College of Textiles and Clothing,Xinjiang University,Urumqi 830017,China;College of Chemistry and Chemical Engineering,Donghua University,Shanghai 201620,China;Xinjiang Key Laboratory of Intelligent and Green Textile,Urumqi 830017,China)

机构地区：[1]新疆大学纺织与服装学院,新疆乌鲁木齐830017 [2]东华大学化学与化工学院,上海201620 [3]新疆智能与绿色纺织重点实验室,新疆乌鲁木齐830017

出　　处：《印染》2024年第7期32-37,共6页China Dyeing and Finishing

摘　　要：选择氯化胆碱(ChCl)与乳酸(LA)合成低共熔溶剂(DES)来提取罗布麻秸秆中的木质素,并将提取的木质素(DL)与聚乙烯醇(PVA)共混,以四硼酸钠为交联剂,通过冷冻干燥技术制备了气凝胶A-PBDL。试验结果表明:DES提取木质素最佳工艺为:n(ChCl)∶n(LA)=1∶9,120℃提取9 h;红外图谱分析得知木质素中含有对羟基苯丙烷、创愈木基和紫丁香基三种结构,平均粒径为3.601μm。研究了气凝胶制备中木质素添加量、PVA浓度和四硼酸钠浓度对气凝胶孔隙率和强力的影响,发现掺杂少量木质素可显著提高气凝胶的力学性能及孔隙率,并增强其热稳定性。Lignin is extracted from Rhizoma pseudofolium straws using a low eutectic solvent(DES)synthe⁃sized from choline chloride(ChCl)and lactic acid(LA).The extracted lignin(DL)is blended with polyvinyl alco⁃hol(PVA),and aerogels A-PBDL are prepared by freeze-drying technology with sodium tetrborate solution as a crosslinking agent.The effects of the ratio of ChCl to LA,temperature and time on the extraction yield are studied.The effects of lignin addition,PVA concentration and sodium tetraborate concentration on the porosity and strength of aerogel are investigated.The results show that the optimal extraction process of lignin with DES is as follows:n(ChCl)∶n(LA)=1∶9,extracted at 120℃for 9 h.The lignin contains p-hydroxyphenylpro⁃pane,guaiacyl and syringyl structures,and the average particle size is 3.601μm.A small amount of lignin doped into the aerogel can significantly improve the mechanical properties and porosity of the aerogel,and en⁃hance its thermal stability.

关 键 词：罗布麻 低共熔溶剂 木质素 气凝胶 

分 类 号：TS199[轻工技术与工程—纺织化学与染整工程] TQ427.26[轻工技术与工程—纺织科学与工程]