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Materials 2018, 11(8), 1354; https://doi.org/10.3390/ma11081354

Composite Cationic Exchange Membranes Prepared from Polyvinyl Alcohol (PVA) and Boronic Acid Copolymers for Alkaline Diffusion Dialysis

Anhui Province Key Laboratory of Environment-friendly Polymer Materials, School of Chemistry & Chemical Engineering, Anhui University, Hefei 230601, China
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Received: 5 June 2018 / Revised: 2 August 2018 / Accepted: 2 August 2018 / Published: 4 August 2018
(This article belongs to the Section Thin Films)
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Abstract

Boronic acid copolymers with a large number of functional groups were obtained via a free radical polymerization method. The corresponding composite membranes for alkaline diffusion dialysis (DD) were prepared by a crosslinking reaction between polyvinyl alcohol (PVA) and the as-obtained boronic acid copolymers. The composite membranes possessed water uptake (WR) of 122.1–194.4%, ion exchange capacities (IECs) of 0.79–1.17 mmol/g, as well as both good mechanical stability (tensile strength of 40.7–49.9 MPa and elongation at break of 52.1–121.1%) and thermal stability. The as-prepared membranes were stable in 2 M NaOH solution at 65 °C with a swelling degree and mass loss of as-prepared membranes in the range of 305–368% and 9.2–22%, respectively. A NaOH/Na2WO4 mixture was used to investigate the separation properties of as-prepared membranes via the DD process. Results indicated that the dialysis coefficients of OH (UOH) were in the range of 0.0079–0.0150 m/h, while the separation factors (S) were in the range of 26.6–53.2. The functional groups from boronic acid copolymer and –OH from PVA were demonstrated to promote the ion transport synergistically. View Full-Text
Keywords: polyvinyl alcohol (PVA); boronic acid copolymers; composite membranes; diffusion dialysis (DD); alkali recovery polyvinyl alcohol (PVA); boronic acid copolymers; composite membranes; diffusion dialysis (DD); alkali recovery
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Liu, D.; Wang, C.; Miao, J.; Xia, R.; Chen, P.; Cao, M.; Wu, B.; Qian, J. Composite Cationic Exchange Membranes Prepared from Polyvinyl Alcohol (PVA) and Boronic Acid Copolymers for Alkaline Diffusion Dialysis. Materials 2018, 11, 1354.

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