Thermo-Responsive Membranes from Blends of PVDF and PNIPAM-b-PVDF Block Copolymers with Linear and Star Architectures
Nunes, Suzana Pereira
KAUST DepartmentChemical Science Program
Physical Science and Engineering (PSE) Division
Biological and Environmental Science and Engineering (BESE) Division
Environmental Science and Engineering Program
KAUST Catalysis Center (KCC)
Embargo End Date2022-09-10
Permanent link to this recordhttp://hdl.handle.net/10754/671152
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AbstractWe report the synthesis of poly(n-isopropylacrylamide)-b-poly(vinylidene fluoride), (PNIPAM-b-PVDF), copolymers with linear and star structures, as well as the self-assembly and fabrication of thermo-responsive membranes from blends of these block copolymers and a linear PVDF homopolymer. The synthesis was achieved by reversible addition–fragmentation chain-transfer sequential copolymerization using mono- or multifunctional transfer agents. The self-assembly in bulk and selective solvents was investigated. The PVDF blocks are crystallizable and hydrophobic and the PNIPAM thermo-responsive in water. The morphology is dominated by the breakout crystallization of the PVDF block. Nanoporous membranes were fabricated by non-solvent-induced phase-separation method. The membranes revealed a macroscale zig–zag morphology, which is dependent on the block copolymer architecture. Due to the presence of PNIPAM, these membranes exhibited thermo-responsive behavior with water permeability and rejection alternately varying with the operating temperature, which is reversible in multiple heating–cooling cycles.
CitationAlgarni, F., Musteata, V. E., Falca, G., Chisca, S., Hadjichristidis, N., & Nunes, S. P. (2021). Thermo-Responsive Membranes from Blends of PVDF and PNIPAM-b-PVDF Block Copolymers with Linear and Star Architectures. Macromolecules. doi:10.1021/acs.macromol.1c01372
SponsorsThis work was supported by King Abdullah University of Science and Technology, grants REP/1/3848-01-01, URF/1/4040-01-01 and base lines.
PublisherAmerican Chemical Society (ACS)