Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

School of Chemistry & Chemical Engineering, Anhui University, Anhui Province Key Laboratory of Environment-friendly Polymer Materials, Hefei 230601, China

Authors to whom correspondence should be addressed.

^†

Lizhen Peng and Xiaonan Huang contributed equally to this work.

Polymers 2020, 12(10), 2360; https://doi.org/10.3390/polym12102360

Received: 28 August 2020 / Revised: 28 September 2020 / Accepted: 28 September 2020 / Published: 14 October 2020

(This article belongs to the Special Issue Conducting Polymer-Based Hybrid Nanomaterials)

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Abstract

Carboxyl-type boronic acid copolymers (CBACs) were synthesized by a radical polymerization method and used for the preparation of polyvinyl alcohol (PVA)-based composite membranes via a solution mixture method. The as-prepared composite membranes exhibited a water uptake (W_R) of 122.6–150.0%, an ion exchange capacity (IEC) of 0.0147–0.0518 mmol g⁻¹, and excellent mechanical (elongation at break (E_b) of 103.8–148.4%, tensile strength (TS) of 38.7–58.6 MPa) and thermal stability. The alkali resistances of the as-prepared membranes were tested by immersing the samples into 2 mol L⁻¹ NaOH solutions at 25 °C for 60 h, and the results were encouraging: the mass loss and swelling degree of the as-prepared membranes were in the ranges of 1.9–5.9% and 222.6–241.9%, respectively. The separation performances of the as-prepared membranes were evaluated by the diffusion dialysis (DD) process with an NaOH/Na₂WO₄ mixture at room temperature. The results demonstrated that the dialysis coefficients of hydroxide (U_OH) were in the range of 0.0147–0.0347 m h⁻¹, and the separation factors (S) were in the range of 29.5–62.6. The introduced carboxyl groups from CBACs and the –OH groups from PVA were both deemed to play significant roles in the promotion of ion transport: the –COO⁻ groups formed negatively charged transport channels for Na⁺ by electrostatic attraction, and the –OH groups promoted the transport of OH⁻ via hydrogen bonding. View Full-Text

Keywords: carboxyl-type boronic acid copolymers (CBACs); composite membranes; alkali recovery; diffusion dialysis (DD)

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MDPI and ACS Style

Peng, L.; Huang, X.; Liu, D.; Miao, J.; Wu, B.; Cao, M.; Ge, Q.; Yang, B.; Su, L.; Xia, R.; Zheng, Z.; Chen, P.; Qian, J. Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis. Polymers 2020, 12, 2360. https://doi.org/10.3390/polym12102360

AMA Style

Peng L, Huang X, Liu D, Miao J, Wu B, Cao M, Ge Q, Yang B, Su L, Xia R, Zheng Z, Chen P, Qian J. Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis. Polymers. 2020; 12(10):2360. https://doi.org/10.3390/polym12102360

Chicago/Turabian Style

Peng, Lizhen, Xiaonan Huang, Dandan Liu, Jibin Miao, Bin Wu, Ming Cao, Qianqian Ge, Bin Yang, Lifen Su, Ru Xia, Zhengzhi Zheng, Peng Chen, and Jiasheng Qian. 2020. "Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis" Polymers 12, no. 10: 2360. https://doi.org/10.3390/polym12102360

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Preparation of Polyvinyl Alcohol (PVA)-Based Composite Membranes Using Carboxyl-Type Boronic Acid Copolymers for Alkaline Diffusion Dialysis

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