文献类型：期刊文献

中文题名：纤维素/聚乙烯醇复合气凝胶制备及其性能研究

英文题名：Preparation and Properties of Cellulose/PVA Composite Aerogels

作者：王猛[1] 唐丽[1] 高莉[1] 曲荣芬[1] 廖头根[1] 刘鹤[2]

第一作者：王猛

机构：[1]云南中烟工业有限责任公司技术中心,云南昆明650231;[2]中国林业科学研究院林产化学工业研究所,江苏南京210042

年份：2021

卷号：41

期号：3

起止页码：95-102

中文期刊名：林产化学与工业

外文期刊名：Chemistry and Industry of Forest Products

收录：CSTPCD;;Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：烟草行业卷烟调香技术重点实验室2018年开放课题(2019539200340210);中国烟草总公司科技重点项目(110201802001);国家重点研发计划资助项目(2018YFD0600402)。

语种：中文

中文关键词：纤维素;聚乙烯醇;气凝胶;压缩性;疏水性

外文关键词：cellulose;PVA;aerogels;compressibility;hydrophobicity

分类号：TQ35;TB34

摘要：针对纤维素(CE)气凝胶机械回弹性、尺寸稳定性差等问题,基于冷冻干燥工艺和化学气相沉积技术,利用聚乙烯醇(PVA)对CE进行复配,以甲基三乙氧基硅烷(MTES)对CE/PVA进行改性,制备了具有轻质性、高弹性和疏水性的多孔S-CE/PVA复合气凝胶。研究了PVA添加量对S-CE/PVA复合气凝胶力学性能的影响,随着引入PVA质量分数的增加,纤维素气凝胶的压缩强度增加;当PVA添加量为纤维素质量的15%(S-CE/PVA-15%)时,气凝胶压缩应力增加至66 kPa,比纯的硅烷改性纤维素气凝胶提升了6.5倍。同时探究了MTES改性对复合气凝胶微观结构、热稳定性、亲/疏水性、比表面积和物理特性的影响,改性后的S-CE/PVA复合气凝胶具有紧密的片层结构,初始分解温度由284.0℃上升至314.6℃,水接触角高达115°,比表面积为109.42 cm^(3)/g,密度为0.045 g/cm^(3),孔隙率大于95%。
Based on the freeze-drying process and chemical vapor deposition technology,polyvinyl alcohol(PVA)was compounded with cellulose to enhance the mechanical compressibility and dimensional stability of cellulose(CE)aerogels,followed by the fabrication of highly elastic,hydrophobic,and porous CE/PVA composite aerogels.The effects of PVA content on the mechanical properties of CE/PVA composite aerogels were studied.As the mass fraction of PVA increased,the compressive strength of cellulose aerogels increased.When the amount of PVA was 15%of the mass of cellulose,the compressive strain increased to 66 kPa,which was increased by 6.5 times.Simultaneously,the influences of silane modification on the microstructure,thermal stability,hydrophobicity,specific surface area and physical properties of composite aerogels were explored,and the results showed that S-CE/PVA composite aerogel modified by methyltriethoxysilane(MTES)had a denser lamellar structure,the initial decomposition temperature rose to 314.6℃,the water contact angle was as high as 115°,the specific surface area was 109.42 cm^(3)/g,the density was 0.045 g/cm^(3),and the porosity was greater than 95%.