Abstract
A series of novel hybrid zwitterionic membranes were prepared via a coupling reaction of trimethoxysilyl functionalized polyethylene glycol (PEG) and zwitterionic process with 1,4-butyrolactone (BL) thereafter. Both FT-IR and 13C NMR spectra confirmed the step reactions. Thermal analysis shows that the weight loss of the hybrid zwitterionic copolymer decreased slightly compared with the non-ionization hybrid precursor and the thermal stability of such zwitterionic copolymer can reach around 240 °C. Streaming potentials display that whether the membranes were coated once or thrice, they always exhibit negative values and no isoelectric point (IEP) was found in the tested pH range. Ion exchange capacities (IECs) reveal that only the cation-exchange capacities (CIECs) were detected and the CIECs of the membranes coated one to four times were in the region of (1.9–2.5) × 10 −2 mequiv. cm −2. Pure water flux shows that it can be affected by the coating times and the substrate. The SEM images suggest that substrates can influence the membrane's microstructures. The increasing electrostatic repulsion between ion pairs and the pendent side structure of polymer chains might be responsible for these unusual behaviors.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.