Abstract
Track-etched poly(ethylene terephthalate) capillary pore membranes with a pore diameter of 690 nm were functionalized via photo-initiated “living” radical graft polymerization with block copolymers of acrylic acid and N-isopropylacrylamide. Preadsorbed xanthone was more efficient than benzophenone in order to achieve higher grafting efficiency and “living” character, including the option to reinitiate a grafted homopolymer to obtain grafted diblock copolymers. Characterizations were mainly done with water flux and dextran diffusion experiments at temperatures below and above the lower critical solution temperature (32°C) of poly(N-isopropylacrylamide) and pH values below and above the pKa value (4.5) of poly(acrylic acid). Block sequences and relative block lengths were identified to obtain stimuli-responsive membranes which have no measurable water flux and allow only low dextran diffusion rates at 25°C and pH 7 (“closed state”), and which reversibly open their pores by either increase of temperature or decrease of pH, or by the combination of both stimuli.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
