高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 984.

• 研究论文 • 上一篇    下一篇

聚乙烯醇/纳米纤维素复合膜的渗透汽化性能及结构表征

白露1, 张力平1, 曲萍1, 高源1, 秦竹2, 孙素琴2   

  1. 1. 北京林业大学材料科学与技术学院, 北京 100083;
    2. 清华大学化学系, 北京 100084
  • 收稿日期:2010-05-04 修回日期:2010-12-09 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 张力平 E-mail:zhanglp418@163.com
  • 基金资助:

    国家林业局“948”引进项目(批准号: 2008-4-075)和国家“九七三”计划项目(批准号: 2010CB732204)资助.

Pervaporation Properties and Characterization of Poly( vinyl alcohol)/Cellulose Nanocrystal Composite Membranes

BAI Lu1, ZHANG Li-Ping1*, QU Ping1, GAO Yuan1, QIN Zhu2, SUN Su-Qin2   

  1. 1. College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China;
    2. Department of Chemistry, Tsinghua University, Beijing 100084, China
  • Received:2010-05-04 Revised:2010-12-09 Online:2011-04-10 Published:2011-03-09
  • Contact: ZHANG Li-Ping E-mail:zhanglp418@163.com
  • Supported by:

    国家林业局“948”引进项目(批准号: 2008-4-075)和国家“九七三”计划项目(批准号: 2010CB732204)资助.

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被引次数

79

摘要： 将聚乙烯醇/纳米纤维素（PVA/NCC）复合膜应用于乙醇-水混合溶液的渗透汽化脱水过程，探讨了纳米纤维素对膜的溶胀性能和渗透汽化性能的影响；利用原子力显微镜（AFM）探测了纳米纤维素的形貌特征；利用傅里叶红外光谱仪(FTIR)、扫描电镜（SEM）、差示扫描量热仪（DSC）和热重分析仪(TGA)对膜结构和热性能进行了表征。研究结果表明：棒状的纳米纤维素与PVA基体间形成了强烈的氢键作用且均匀分散在PVA基质中；纳米纤维素的加入提高了膜的熔融温度，增加了膜的热稳定性、有效的抑制了膜的溶胀；在PVA中添加纳米纤维素可以提高膜的分离性能，用纳米纤维素含量为2%的复合膜在80℃时分离乙醇浓度为90%的乙醇水溶液，膜的分离因子达到347，比未加时提高24%。

关键词: 聚乙烯醇, 渗透汽化, 纳米纤维素, 复合膜

Abstract: Poly( vinyl alcohol) （PVA）/cellulose nanocrystal (NCC) composite membranes were used in the pervaporation separation of water-ethanol feed mixtures, and characterized by fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetric(DSC) and thermogravimetry (TG). Atomic force microscope (AFM) was used to characterize the cellulose nanocrystal. The characterization results demonstrated that cellulose nanocrystal (NCC） displayed slender rods and dispersed homogeneously within the PVA matrix, which could be assigned to the hydrogen bonds formed between PVA and NCC. The DSC and TG analysis demonstrated that the nanocomposite membranes exhibited a increase in melting temperature and higher thermal resistance. The nanocomposite membranes had good pervaporation properties. Among all the prepared membranes, PVA/NCC nanocomposite membrane containing 2 wt% NCC exhibited the best separation factor, whose averaged separation factor was 347 for 90wt% aqueous solution of ethanol at 80 ℃ and 24% higher than that of crosslinked PVA membrane.

Key words: Poly (vinyl alcohol), Pervaporation, Cellulose nanocrystal, Composite membrane

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