Hydrophilic modification of poly(vinylidene fluoride) membrane with poly(vinyl pyrrolidone) via a cross‐linking reaction

Abstract

A highly hydrophilic hollow fiber poly(vinylidene fluoride) (PVDF) membrane [PVDF-cl-poly(vinyl pyrrolidone) (PVP) membrane] was prepared by a cross-linking reaction with the hydrophilic PVP, which was immobilized firmly on the outer surface and cross-section of the PVDF hollow fiber membrane via a simple immersion process. The cross-linking between PVDF and PVP was firstly verified via nuclear magnetic resonance measurement on PVP solution after cross-linking. The hydrophilic stability of the modified PVDF membrane was evaluated by measuring the pure water flux after different times of immersion and drying. The antifouling properties were estimated by cyclic filtration of protein solution. When the cross-linking time was as long as 6 hr and the PVP content reached 5 wt %, the pure water flux (J v ) was constant as $ 600 L m À2 hr À1 . The hydrophilicity of the PVDF-cl-PVP membrane was significantly enhanced and exhibited a good stability. The PVDF-cl-PVP membrane showed an excellent anti-proteinfouling performance during the cyclic filtration of bovine serum albumin solution. Therefore, a highly hydrophilic and anti-proteinfouling PVDF hollow fiber membrane with a long-term stability can be prepared by a simple and economical cross-linking process with PVP.

Enhanced separation performance of PVDF/PAN blend membrane based on PVP tuning

“…The addition of PVP as an additive has been investigated in previous researches such as PVDF/additives (i.e. ethanol, glycerol, lithium chloride, lithium perchlorate, water, and PVP (as pore former)) [24], PVDF/PVP [25][26][27], and PVDF/PES/ PVP [8].…”

Poly(vinylidene fluoride)‐Based Membranes for Microalgae Filtration

“…It is blended with several polymers, i.e., polyethersulfone , polyacrylonitrile , and PVDF . Instead of simply blending, modification of PVDF with PVP can also be done by cross‐linking , . Using the latter approach, the synthesized membranes were used to filter flavonoids from Gingko biloba extract and bovine serum albumin (BSA) where the performance of the hydrophilized membranes was better compared to the pristine membranes.…”

Preparation of PVDF/poly(tetrafluoroethylene‐co‐vinyl alcohol) blend membranes with antifouling propensities via nonsolvent induced phase separation method

“…In this method, the key issue is finding a suitable material with good hydrophilicity and good compatibility with PVDF. Although linear hydrophilic polymers, such as poly(vinyl alcohol) (PVA), poly(vinyl pyrrolidone) (PVP) and poly(ethylene glycol) (PEG), are cheap and easy to obtain, the major issue is their poor compatibility with the host polymer, PVDF. Furthermore, these linear polymers are soluble in water, which means that they leach out from the PVDF membrane during filtration, resulting in a gradual decrease in its hydrophilicity .…”