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Polymers 2014, 6(7), 1914-1928; doi:10.3390/polym6071914

Sulfonation Process and Desalination Effect of Polystyrene/PVDF Semi-Interpenetrating Polymer Network Cation Exchange Membrane

School of Biotechnology and Chemical Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
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Received: 12 March 2014 / Revised: 3 June 2014 / Accepted: 25 June 2014 / Published: 7 July 2014
(This article belongs to the Special Issue Interpenetrating Polymer Networks)
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Abstract

With the classical sulfonation method of polystyrene-based strongly acidic cation exchange resins, polystyrene/polyvinylidene fluoride (PVDF) alloy particles were sulfonated to obtain a cation exchange resin, which was then directly thermoformed to prepare a semi-interpenetrating polymer network (semi-IPN) cation exchange membrane. The effects of the swelling agent, sulfonation time and temperature and the relative contents of polystyrene and divinylbenzene (DVB) in the alloy particles on the feasibility of the membrane formation are discussed. The results indicate that a favorable sulfonation degree above 80% and a suitable ion exchange capacity of 1.5–2.4 mmol/g can be gained, with concentrated sulfuric acid as the sulfonation agent and 1,2-dichloroethane as the swelling agent. The running electrical resistance and desalination effect of the prepared cation exchange membrane were measured in a pilot-scale electrodialyser and not only obviously exceeded a commercial heterogeneous cation exchange membrane, but was also very close to a commercial homogenous membrane. In this way, the authors have combined the classical sulfonation method of polystyrene-based cation exchange resins with the traditional thermoforming manufacturing process of heterogeneous cation exchange membranes, to successfully develop a novel, low-price, but relatively high-performance polystyrene/PVDF cation exchange membrane with the semi-IPN structure. View Full-Text
Keywords: semi-interpenetrating polymer network (semi-IPN); cation exchange membrane; polystyrene; sulfonation; desalination semi-interpenetrating polymer network (semi-IPN); cation exchange membrane; polystyrene; sulfonation; desalination
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MDPI and ACS Style

Lei, Y.-L.; Luo, Y.-J.; Chen, F.; Mei, L.-H. Sulfonation Process and Desalination Effect of Polystyrene/PVDF Semi-Interpenetrating Polymer Network Cation Exchange Membrane. Polymers 2014, 6, 1914-1928.

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