摘要
为有效提高农业废弃物秸秆的再利用价值,以棉花秆为原料,通过亚氯酸钠氧化、碱液溶解、硫酸水解以及2,2,6,6-四甲基哌啶-1-氧自由基(TEMPO)氧化-高压均质等步骤制备了棉花秆纤维素纳米晶(CNC)和纤维素纳米纤维(CNF),并对制备过程产物的微观形貌、结晶性、热稳定性、粒径大小等综合性能进行测试和表征。在此基础上,探讨了棉花秆提取纳米纤维素的添加对复合水凝胶材料的力学、吸水以及保水性能的影响。结果表明,棉花秆纤维素提取量为39.5%,纯纤维素提取量则高达85.2%,均远高于水稻、小麦等农作物秸秆;所制备的CNC和CNF均具有较大的长径比、较高的结晶度与热稳定性以及良好的溶液分散性;与单一水凝胶相比,添加棉花秆纳米纤维素后复合材料的力学、吸水以及保水性能均显著提升,表明棉花秆提取纳米纤维素可作为一种优异的复合材料基质或性能补强材料。
In order to effectively improve the reuse value of agricultural waste straw,cotton stalk cellulose nanocrystals(CNC)and cellulose nanofibers(CNF)were prepared by the steps of sodium chlorite oxidation,lye dissolution,sulfuric acid hydrolysis,2,2,6,6-tetramethylpiperidine-1-o radical(TEMPO)oxidation,and high-pressure homogenization using cotton stalk as raw material.And the comprehensive properties,such as,microscopic morphology,crystallinity,thermal stability,and particle size of the products during the preparation process were tested and characterized.On this basis,the effects of the addition of nanocellulose extracted from cotton stalks on the mechanical,water absorption,and water retention properties of the composite hydrogel materials were discussed.The results show that the cellulose extraction amount of cotton stalk is 39.5%,and the pure fiber content is as high as 85.2%,which is much higher than those of rice,wheat,and other crop straws.The prepared CNC and CNF have a large aspect ratio,with higher crystallinity,thermal stability,and good solution dispersibility.Comparing with single hydrogel,the mechanical,water absorption,and water retention properties of the composites are significantly improved after adding cotton stalk nanocellulose,indicating that the nanofibers extracted from cotton stalks are significantly improved.It can be used as an excellent composite matrix or reinforcing material.
作者
皮荷杰
苗家铭
谢思兰
代丽平
唐嘉辉
林小娟
廖剑宇
PI Hejie;MIAO Jiaming;XIE Silan;DAI Liping;TANG Jiahui;LIN Xiaojuan;LIAO Jianyu(College of Urban and Environment Sciences,Hunan University of Technology,Zhuzhou 412007,China;Hunan Provincial Key Laboratory of Comprehensive Utilization of Agricultural and Animal Husbandry Waste Resources,Hunan University of Technology,Zhuzhou 412007,China;Hunan Key Laboratory of Water Safety Discharge in Urban and Its Resource Utilization,Hunan University of Technology,Zhuzhou 412007,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2022年第6期109-117,共9页
China Plastics Industry
基金
国家重点研发项目课题(2019YFD1101305)
湖南省自然科学基金(2020JJ6068,2020JJ6074)。
关键词
棉花秆
纳米纤维素
制备
表征
复合水凝胶
性能增效
Cotton Stalk
Nanocellulose
Preparation
Characterization
Composite Hydrogel
Performance Enhancement
