纳米甲壳素的分散性及其对再生纤维素膜的增强性能研究  

Study on the dispersibility of nano-chitin and its enhancement performance onregenerated cellulose films

作　　者：彭卫芳 王文聪 PENG Weifang;WANG Wencong(College of Textile Science and Engineering,Jiangnan University,Wuxi 214122,China)

机构地区：[1]江南大学纺织科学与工程学院,江苏无锡214122

出　　处：《丝绸》2024年第12期88-95,共8页Journal of Silk

基　　金：国家自然科学基金项目(51703085)。

摘　　要：将纳米甲壳素与纤维素复合可解决再生纤维素制品力学性能偏低的问题,但因复合过程纳米颗粒易团聚限制了其增强效果。为提升分散效果,本文研究了纳米甲壳素在水(H_(2)O)、四乙基氢氧化铵水溶液(TEAOH/H_(2)O)、不同质量分数尿素水溶液(Urea/H_(2)O)、二甲基亚砜(DMSO)等试剂中的分散性,发现DMSO对纳米甲壳素的分散相对更优。将不同质量分数纳米甲壳素/DMSO添加到纤维素/TEAOH/H_(2)O溶液中制备得到再生纤维素复合膜,并对复合膜的结构、形貌、力学性能进行表征。结果表明,当纳米甲壳素添加量为9%时,复合膜力学性能最佳,断裂强度和断裂伸长率较空白样增长54%和150%;9%纳米甲壳素的添加有助于复合膜引入酰胺基团和提高结晶度,且纳米甲壳素在复合膜中总体分散较均匀,无明显聚集现象。Nano-chitin is a nanoscale material derived from natural polysaccharide chitin,and has various excellent properties such as biocompatibility,biodegradability and high specific surface area.This makes it have broad application potential in various fields such as biomedicine,food,cosmetics,environmental protection,textiles and packaging.However,one of major challenges for the nano-chitin is its poor dispersibility.Due to the high specific surface area and surface activity of nanoparticles,they are prone to agglomerate in solution and form larger aggregates,which limits their uniform distribution in composite materials and hinders their reinforcement effect.The aggregation of nano-chitin can lead to the deterioration in composite materials properties,such as mechanical strength,optical properties and antibacterial effects.To improve the dispersibility of nano-chitin,the following strategies are usually adopted:increasing surface charge or introducing hydrophilic groups through chemical modification can enhance the stability of nanoparticles in aqueous media;adding appropriate dispersants or surfactants can help stabilize nanoparticles and prevent aggregation;utilizing the cavitation effect of ultrasound can disrupt the attraction between particles and promote the uniform dispersion of nano-chitin in solution.Almong these strategies,using dispersants to disperse nano-chitin is relatively simpl and efficient.Therefore,a suitable dispersant DMSO(dimethyl sulfoxide)was selected in this article for uniform dispersion of nano-chitin,and then the enhancement effect of nano-chitin on regenerated cellulose films was further studied.To improve the dispersion effect of nano-chitin,firstly a series of techniques such as transmittance,turbidity testing and centrifugal sedimentation experiments were adopted to investigate the dispersibility of nano-chitin in water(H_(2)O),tetraethylammonium hydroxide aqueous solution(TEAOH/H_(2)O),urea aqueous solution of different mass fractions(Urea/H_(2)O),and dimethyl sulfoxide(DMSO).It was f

关 键 词：纳米甲壳素 二甲基亚砜 分散性 四乙基氢氧化铵 再生纤维素复合膜 

分 类 号：TS102.51[轻工技术与工程—纺织工程]