纳米纤维素/木质素抗紫外膜的制备与性能  

Preparation and Property of Nanocellulose/Lignin Anti-Ultraviolet Film

作　　者：苏雯皓 舒璇 董茂林 罗丹 刘秀宇 戴红旗 卞辉洋 Wenhao Su;Xuan Shu;Maolin Dong;Dan Luo;Xiuyu Liu;Hongqi Dai;Huiyang Bian(College of Light Industry and Food Engineering,Nanjing Forestry University,Nanjing 210037,China;Key Laboratory of Chemistry and Engineering of Forest Products,State Ethnic Affairs Commission,Guangxi Key Laboratory of Chemistry and Engineering of Forests Products,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,江苏南京210037 [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,广西南宁530006

出　　处：《高分子材料科学与工程》2022年第12期93-99,共7页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(22208163);广西林产化学与工程重点实验室开放课题(GXFK2206);江苏省高等学校大学生创新创业训练计划(202110298051Z)。

摘　　要：采用顺丁烯二酸预处理杨木木屑提取得到木质素,按照不同含量将其与纳米纤维素机械混合,经抽滤干燥工艺得到了纳米纤维素/木质素复合膜材料。采用扫描电镜、万能拉力机、紫外分光光度计、分光密度计和热重分析仪对材料微观形貌、力学性能、光学性能及热稳定性进行测试。结果表明,纯纳米纤维素(CNF)膜表面光滑致密,木质素的添加使复合膜的表面粗糙度从19.8 nm增加到62.7 nm。随着木质素含量的增加,复合膜的拉伸强度从140 MPa降低到67.6MPa。木质素质量分数为5%时,弹性模量最高为7.11 GPa。同时,木质素赋予了材料优异的紫外屏蔽性能,复合膜对UVA和UVB波段的屏蔽率分别为99.23%和100%。此外,木质素的引入提高了复合膜的热稳定性,最高热失重降解温度为313℃。纳米纤维素/木质素复合薄膜在食品包装、紫外线防护和农用地膜等领域显示出很好的应用前景。Lignin was isolated from poplar sawdust through maleic acid pretreatment,then mechanically mixed with nannocellulose according to different contents to prepare nanocellulose/lignin composite films by filtration and drying process.The microstructure,mechanical property,optical property and thermal stability of the materials were tested by scanning electron microscope,universal tensile testing machine,ultraviolet spectrophotometer,spectrodensitometer and thermogravimetric analyzer.The results show that the surface of the pure CNF film is smooth and dense,while the addition of lignin makes film rough with the increasing root mean square(RMS)roughness value from 19.8 nm to 62.7 nm.With the increase of lignin content,the tensile strength of the composite films is decreased from 140 MPa to 67.6 MPa.When the lignin mass fraction is 5%,the elastic modulus is up to 7.11GPa.In the meantime,lignin endows the composite films with excellent ultraviolet shielding properties with the UVA and UVB blocking rate of 99.23%and 100%,respectively.In addition,the incorporation of lignin improves the thermal stability of the composite films,and the maximal mass loss temperature is 313℃.The nanocellulose/lignin composite films show high application potential in the fields of food packaging,UV protection,and agricultural mulching film.

关 键 词：纳米纤维素 木质素 复合材料 膜 紫外屏蔽 

分 类 号：TB383[一般工业技术—材料科学与工程]