壳聚糖增强纳米纤维素-蒙脱土复合膜的结构与性能  

Structure and properties of chitosan enhanced cellulose nanofiber-montmorillonite composite membrane

作　　者：汪云逸 邹楚文 尹冉 尤政通 王海刚[1] WANG Yunyi;ZOU Chuwen;YIN Ran;YOU Zhengtong;WANG Haigang(Key Laboratory of Bio-based Material Science and Technology of Ministry of Education,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学生物质材料科学与技术教育部重点实验室,哈尔滨150040

出　　处：《复合材料学报》2024年第8期4299-4309,共11页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划课题(2023YFD2201404);黑龙江省自然科学基金(LH2022C010)。

摘　　要：利用纤维素和无机物模仿天然贝壳中高度有序的“砖-砂浆”结构制备高强度功能复合材料,是制备绿色包装膜的优秀选择,二者的界面结合是获得理想结构与性能的关键。本文以羧基化纤维素纳米纤维(CNFMG)和蒙脱土(MTM)纳米片制备膜材料,采用壳聚糖(CS)通过静电作用增强界面结合。研究了CS与CNFMG和MTM之间的静电相互作用对纳米复合材料结构、力学性能和热稳定性的影响。结果表明:复合膜中MTM以纳米片状形态有序地分散于CNFMG网络间。与CNFMG-MTM二元膜相比,CS加入后的三元膜拉伸强度达到119.2 MPa,强度提升1倍;断裂能达到10.9 MJ/m^(3),韧性提升5.4倍。复合膜为半透明状,具有良好的紫外屏蔽性,CS的加入也提升了复合膜的热稳定性。本文的研究结果可为纤维素基珍珠层仿生材料的研究和应用提供思路。The way of mimicking the ordered"brick and mortar"structure in natural shells to prepare high-strength functional composite materials with cellulose and inorganic substances of which the interface bonding is the key to achieving ideal structure and performance is a potential excellent choice for producing naturally degradable packaging films.The single interfacial binding force between nanocellulose and montmorillonite results in insufficient mechanical properties.In this work,carboxymethyl cellulose nanofibers(CNFMG)and montmorillonite(MTM)nanosheets were used to prepare pearl layer films in which chitosan(CS)enhanced interface bonding through electrostatic interaction.The effects of electrostatic interactions between CS,CNFMG,and MTM on the structure,mechanical properties,and thermal stability of nanocomposites were studied.The results indicate that MTM in the composite membrane was orderly dispersed in nanosheet form between CNFMG networks.Compared with the CNFMG-MTM binary film,the tensile strength of the ternary film with the addition of CS reached 119.2 MPa,which doubled the strength.The fracture energy reached 10.9 MJ/m^(3),and the toughness was increased by 5.4 times.The composite film was semitransparent and had good UV shielding properties.The addition of CS also enhanced the thermal stability of the composite film.The research results of this article can provide ideas for the research and application of cellulose based pearl layer biomimetic materials.

关 键 词：纳米纤维素 蒙脱土 壳聚糖 复合膜 珍珠层结构仿生 

分 类 号：TB332[一般工业技术—材料科学与工程] TB330.1