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

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 984.

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

BAI Lu¹, ZHANG Li-Ping^1*, QU Ping¹, GAO Yuan¹, QIN Zhu², SUN Su-Qin²

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.

Abstract

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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BAI Lu, ZHANG Li-Ping*, QU Ping, GAO Yuan, QIN Zhu, SUN Su-Qin. Pervaporation Properties and Characterization of Poly( vinyl alcohol)/Cellulose Nanocrystal Composite Membranes[J]. Chem. J. Chinese Universities, 2011, 32(4): 984.

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

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