Thermo-responsive polyacrylonitrile membranes prepared with poly(acrylonitrile-g-isopropylacrylamide) as an additive

• Published in: Journal of membrane science Vol. 432; pp. 42 - 49
• Main Authors: Fei, Zheng-Dong, Wan, Ling-Shu, Wang, Wu-Min, Zhong, Ming-Qiang, Xu, Zhi-Kang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2013; Elsevier
• Subjects: Amphiphilic graft polymer; Applied sciences; artificial membranes; Chemistry; Colloidal state and disperse state; composite polymers; contact angle; Exact sciences and technology; Exchange resins and membranes; Forms of application and semi-finished materials; Fourier transform infrared spectroscopy; General and physical chemistry; hydrophilicity; Immersion precipitation phase inversion; Membranes; nuclear magnetic resonance spectroscopy; Polyacrylonitrile; Polymer industry, paints, wood; scanning electron microscopes; Surface segregation; Technology of polymers; Thermo-responsive membrane; water analysis; X-ray photoelectron spectroscopy; Polyacrylonitrile; Thermo-responsive membrane; Immersion precipitation phase inversion; Surface segregation; Amphiphilic graft polymer; Polymeric membrane; Graft copolymer; Immersion; Acrylamide derivative polymer; Additive; Precipitation; Acrylonitrile polymer; Amphiphilic polymer
• ISSN: 0376-7388; 1873-3123
• DOI: 10.1016/j.memsci.2013.01.008

Thermo-responsive polyacrylonitrile (PAN) membranes were prepared by the immersion precipitation phase inversion process using poly(acrylonitrile-graft-isopropylacrylamide) [P(AN-g-NIPAAm)] as an additive. This additive was synthesized by a facile approach based on the combination of reversible addition–fragmentation chain transfer and thiol-ene click chemistry followed by radical copolymerization. The graft copolymer was characterized by Fourier transform infrared spectroscopy and proton nuclear magnetic resonance. Its side chains thermo-responsibility was determined by ultraviolet analysis and water contact angle measurement. Effects of P(AN-g-NIPAAm) addition on the morphologies of PAN membranes were investigated by scanning electron microscope. X-ray photoelectron spectroscopy was conducted at different take-off angles to elucidate the surface segregation of the amphiphilic graft copolymer in the prepared membranes. Results show that the hydrophilic PNIPAAm chains greatly segregate at the membrane surface, which endows these PAN membranes with obvious thermo-responsibility for water permeation. ► A facile method is described for the preparation of thermo-responsive membranes. ► Poly(acrylonitrile-graft-isopropylacrylamide) was synthesized by a one-pot approach. ► Hydrophilic PNIPAAm side chains are greatly enriched at the membrane surfaces.