前驱体浓度对交联纤维素气凝胶性能的影响  

Effects of Precursor Concentration on Properties of Cross-linked Cellulose Aerogels

作　　者：降帅 张美玲 刘丽芳[1] 张丽 张志成 马晓飞 JIANG Shuai;ZHANG Mei-ling;LIU Li-fang;ZHANG Li;ZHANG Zhi-cheng;MA Xiao-fei(College of Textiles,Donghua University,Shanghai 201620;Anhui Sanbao Cotton Spinning and Knitting Investment Co.,Ltd,Fuyang 236500)

机构地区：[1]东华大学纺织学院,上海201620 [2]安徽三宝棉纺针织投资有限公司,安徽阜阳236500

出　　处：《纺织科学与工程学报》2020年第4期43-47,共5页Journal of Textile Science & Engineering

摘　　要：为改善纤维素气凝胶的力学性能,采用甲基三甲氧基硅烷(MTMS)对以纤维素纳米纤维(CNF)为骨架的气凝胶进行交联改性,研究CNF前驱体浓度和MTMS/CNF比例对交联气凝胶性能的影响。结果表明:MTMS与CNF形成了稳定的交联结构;交联后纤维素气凝胶具有良好的疏水性,压缩强度和弹性回复率均显著提升,弹性回复率可达99%左右,并能够承受远大于自身重量的载荷;此外,随着CNF前驱体浓度的增大,交联气凝胶抵抗变形的能力增强;且当气凝胶中MTMS与CNF比例增大为2 ∶1时,在相同前驱体浓度下交联气凝胶抵抗变形的能力进一步提高。In order to improve the mechanical properties of cellulose aerogels,methyltrimethoxysilane(MTMS)was used to crosslink and modify the cellulose nanofibril(CNF)-based aerogels.The effects of CNF precursor concentration and MTMS/CNF ratio on the properties of cross-linked aerogels were studied.The results showed that MTMS and CNF formed a stable cross-linking structure.After cross-linking,the cellulose aerogels had good hydrophobicity,and the compressive strength and elastic recovery rate were significantly improved.Especially,the elastic recovery rates of aerogels reached about 99%and could withstand the load far greater than their own weight.Moreover,the ability of the cross-linked aerogels to resist deformation improved with the increase of CNF precursor concentration.When the ratio of MTMS and CNF increased to 2∶1,this ability further improved at the same precursor concentration.

关 键 词：纤维素纳米纤维(CNF) 甲基三甲氧基硅烷(MTMS) 气凝胶 化学交联 

分 类 号：O636.11[理学—高分子化学] TB34[理学—化学]