Citation: LIU Ling-Ling, DING Lei, XU Li, QIAO Jin-Li, SHENG Jia-Wei. Synthesis and Properties of Chemically Cross-Linked Poly(vinyl alcohol) Modified Quaterized Hydroxyethylcellulose Ethoxylate as Novel Alkaline Anion-Exchange Membrane[J]. Acta Physico-Chimica Sinica, ;2011, 27(11): 2665-2670. doi: 10.3866/PKU.WHXB20111106 shu

Synthesis and Properties of Chemically Cross-Linked Poly(vinyl alcohol) Modified Quaterized Hydroxyethylcellulose Ethoxylate as Novel Alkaline Anion-Exchange Membrane

1.
1. College of Environmental Science and Engineering, Donghua University, Shanghai 201620, P. R. China;
2. College of Chemical Engineering and Materials, Zhejiang Industrial University, Hangzhou 310032, P. R. China

Received Date: 13 June 2011
Available Online: 30 August 2011
Fund Project: 国家自然科学基金(21173039) (21173039) 上海市浦江人才基金(08PJ14096) (08PJ14096) 上海市自然科学基金(09ZR1433300) (09ZR1433300) 浙江省重中之重学科开放基金(20110927) (20110927) 教育部归国留学人员基金(2009(1001)) (2009(1001))上海市重点学科项目(B604)资助项目 (B604)

Much attention has been paid to alkaline ion-exchange membranes with high alkaline stability. In this work, chemically cross-linked poly(vinyl alcohol) modified quaterized hydroxyethylcellulose ethoxylate (PVA/QHECE) membranes were prepared and evaluated as OH^--conducting polymer electrolytes. The membranes were characterized using Fourier transform infrared (FTIR) spectra, thermogravimetric (TG) analysis, and the alternating current (AC) impedance technique as for their inner structure, thermal stability, alkaline resistance stability, and OH^- conductivity (σ). The OH^- conductivity of the membranes was investigated as a function of cross-linking time, the content of cross-linking agent, polymer composition, and water uptake. It was found that membrane swelling decreased with cross-linking time accompanied by an improvement in mechanical properties but no obvious decrease in OH^- conductivity resulted from the reduced water uptake. The OH^- conductivities in the range of 3.26×10^-4-4.44×10^-4 S·cm^-1 were obtained at room temperature ((19 ± 2)°C), depending on the different PVA/QHECE compositions. TG analysis showed that the PVA/QHECE membrane exhibited high thermal stability at up to 260°C when the QHECE content was 42.9%. In addition, the membranes had a high alkaline stability without a loss of integrity and OH^- conductivity after immersion in 6 mol·L^-1 KOH at 80°C for 168 h.
- Alkaline anion-exchange membrane,
- PVA,
- QHECE,
- Blending and chemical crosslinking,
- OH^- conductivity,
- Alkaline resistance stability
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