【作者】 白露； 李帅； 高源； 曲萍； 张力平；

【Author】 BAI Lu,Li Shuai,GAO Yuan,QU Ping,ZHANG Liping (College of Material Science and Technology,Beijing Forestry University Beijing 100083,China)

【机构】 北京林业大学 材料科学与技术学院；

【摘要】 制得不同纳米纤维素含量的纳米纤维素/聚乙烯醇渗透汽化复合膜.测定了纳米纤维素的添加对膜溶胀度、渗透汽化性能和机械性能的影响.结果表明:纳米纤维素的加入可以有效降低膜的溶胀度,添加3%的纳米纤维素时,复合膜材料的分离因子从143提高到174,渗透通量略有降低.同时考察了不同渗透汽化温度和不同乙醇浓度对复合膜渗透汽化性能的影响.对膜进行机械性能测试,结果表明纳米纤维素的加入可以同时提高膜的抗张强度和断裂伸长率.更多还原

【Abstract】 In this study,pervaporation membranes were prepared from poly(vinyl alcohol)(PVA) with different amounts of cellulose nanocrystals as filler.The pervaporation performance of these membranes was investigated using the separation of ethanol-water mixture as model system.Among all the prepared membranes,PVA/cellulose nanocomposite membrane containing 3 wt%cellulose nanocrystals exhibited the best pervaporation performance,whose averaged permeation flux reduced slightly but separation factor was increased from 143 to 174 for 80%aqueous solution of ethanol at 80℃.With the addition of 3 wt% NCC to PVOH the ultimate tensile strength showed improvement compared to pure PVA.The PVA/NCC nanocomposite membrane had shown increases in elongation at low filler loadings.更多还原