马来酸改性木质素增强纳米纤维素复合膜的制备及性能  

Preparation and properties of maleic acid modified lignin reinforced nanocellulose composite film

作　　者：罗丹 舒璇 孙高峰 刘秀宇 刘超 戴红旗 卞辉洋 LUO Dan;SHU Xuan;SUN Gaofeng;LIU Xiuyu;LIU Chao;DAI Hongqi;BIAN Huiyang(College of Light Industry and Food Engineering,Nanjing Forestry University,Nanjing 210037,China;Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Guangxi University for Nationalities,Nanning 530006,China)

机构地区：[1]南京林业大学轻工与食品学院,南京210037 [2]广西民族大学林产化学与工程国家民委重点实验室广西林产化学与工程重点实验室,南宁530006

出　　处：《复合材料学报》2025年第2期791-801,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(22208163,22208161);2024年江苏省高校“青蓝工程”项目;广西林产化学与工程重点实验室开放课题(GXFK2206);江苏省研究生科研与实践创新计划项目(SJCX22_0320);江苏省高等学校大学生创新创业训练计划项目(202310298057Z)。

摘　　要：以小麦秸秆为原料,采用金属氯化物催化马来酸分离提取木质素纳米颗粒(LNP)。随着金属氯化物的添加,制备得到粒径小、羧基含量高(4.83 mmol/g)、分散性好、含有不同金属离子的LNP。然后将LNP作为增强剂添加到纳米纤维素(CNF)中,采用真空过滤法制备得到复合薄膜材料。对纯CNF膜和复合膜的表面形貌、光学性能、表面色度值和力学性能进行比较分析。结果表明:LNP添加量为3wt%时,复合膜具有超过95%的UVA屏蔽率和超过99%的UVB屏蔽率。同时,LNP的加入显著提高了复合膜的拉伸强度(最高达到188.5 MPa),采用AFM测得CNF和不同LNP之间的相互作用力(276~406 nN)均高于CNF之间的相互作用力(202 nN),与复合膜的拉伸强度提高相一致。综上所述,本文在CNF膜中引入含金属离子的LNP,在复合膜中构建了具有金属离子交联和氢键结合相互作用的超强网络,为木质素增强纤维素基薄膜材料的开发提供新思路。Lignin nanoparticles(LNP)were isolated from wheat straw using metal chloride-catalyzed maleic acid pretreatment in this study.With the addition of metal chlorides,LNP with small particle size,high carboxyl content(4.83 mmol/g),good dispersion and containing different metal ions were prepared.Subsequently,LNP was added as reinforcing agents to cellulose nanofibrils(CNF),and the composite films were successfully prepared by vacuum filtration method.The surface morphology,optical property,surface chromaticity value and mechanical property of pure CNF and composite films are compared and analyzed.The results show that the composite films could achieve more than 95%UVA shielding ratio and 99%UVB shielding ratio when LNP content is only 3wt%.Meanwhile,the addition of LNP significantly increase the tensile strength of composite film(up to 188.5 MPa).The interaction forces between CNF and different LNPs(276-406 nN)are all higher than those between CNFs(202 nN)as measured using AFM,which is consistent with the improvement in tensile strength of the composite films.In summary,LNP containing metal ions are introduced into CNF films to construct super-strong network with metal ion cross-linking and hydrogen bonding interactions,which provides a new idea for the development of lignin-reinforced cellulosebased film materials.

关 键 词：木质素纳米颗粒 纳米纤维素 复合薄膜 金属离子交联 氢键结合 

分 类 号：TB332[一般工业技术—材料科学与工程]