A series of amphiphilic graft copolymers of poly (vinylidene fluoride-co-chlorotrifluoroethylene)-g-poly(2-vinyl pyridine), P (VDF-co-CTFE)-g-P2VP, with different degrees of P2VP grafting (from 26.3 to 45.6 wt%) was synthesized via one-pot atom transfer radical polymerization (ATRP). The amphiphilic properties of P (VDF-co-CTFE)-g-P2VP graft copolymers allowed itself to self-assemble into nanoscale structures. P (VDF-co-CTFE)-g-P2VP graft copolymers were introduced into neat P (VDF-co-CTFE) as additives to form blending membranes. When two different solvents, N-methyl-2-pyrrolidone (NMP) and dimethylformamide (DMF), were used, specific organized crystalline structures were observed only in the NMP systems. P (VDF-co-CTFE)-g-P2VP played a pivotal role in controlling the morphology and pore structure of membranes. The water flux of the membranes increased from 57.2 to 310.1 L m−2 h−1 bar−1 with an increase in the PVDF-co-CTFE-g-P2VP loading (from 0 to 30 wt%) due to increased porosity and hydrophilicity. The flux recovery ratio (FRR) increased from 67.03% to 87.18%, and the irreversible fouling (Rir) decreased from 32.97% to 12.82%. Moreover, the pure gas permeance of the membranes with respect to N2 was as high as 6.2 × 104 GPU (1 GPU = 10–6 cm3[STP]/[s cm2 cmHg]), indicating their possible use as a porous polymer support for gas separation applications.
Bibliographical noteFunding Information:
This work was financially supported by a grant from the National Research Foundation (NRF) of South Korea funded by the Ministry of Science, ICT, and Future Planning (NRF-2017R1A4A1014569, NRF-2017R1D1A1B06028030, NRF-2018M3A7B4071535).
All Science Journal Classification (ASJC) codes
- Polymers and Plastics