Crosslinked PVDF membranes for aqueous and extreme pH nanofiltration

Goethem, Cédric Van; Mertens, Matthias; Vankelecom, Ivo F.J.

doi:10.1016/j.memsci.2018.11.036

Cited by 55 publications

(21 citation statements)

References 37 publications

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“…the loss of the H-F functional group of PVDF structures. This finding is consistent with the publication of a number of researchers who claimed the same color change after treatment for several hours [7], [23], [34], [36], [37]. The PVDF dehydrochlorination has triggered the appearance of a typical peak of the C=C functional group in pure PVDF membrane spectra, as shown in Fig.…”

Section: F Chemical Resistancesupporting

confidence: 92%

Development of a New Polymer Membrane: Polyvinylidene fluoride/Polyetherimide Blend Membrane

Kusumawati

Santoso

Wibawa

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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Porous polyetherimide (PEI)/polyvinylidene fluoride (PVDF) coated flat sheet membranes with different compositions and polyethene glycol (PEG) pyrogenic additives have been prepared by non-solvent induced phase separation for the separation of metal salts and sucrose. By using non-solvent induction phase separation (NIPS), it has succeeded in preparing new members of mixed matrix PVDF membrane with (i) asymmetry pore structure, (ii) porosity 7.19%-18.93%, (iii) pore size 0.196 nm-0.453 nm and (iv) mechanical strength 4262.04-24472.57 N/m2, (vi) permeability respectively of 500.48 L/m2.h.bar for C12H22O11; 642.94 L/m2.h.bar for NaCl; 623.64 L/m2.h.bar for MgCl2; 1060.39 L/m2.h.bar for CaCl2; and 1292.85 L/m2.h.bar for CuSO4. Specifically, increasing PEI levels up to 2(wt.%) - 8 (wt.%) has reduced overall porosity and pore size, thus having a specific impact on mechanical strength, pure water permeability (PWF) and the permeability of the feed solution. The opposite phenomenon is observed when the PEI level reaches 10 (wt.%) - 14 (wt.%). Furthermore, compared to pure PEI membranes, PVDF/PEI composite membranes were observed to have a higher resistance to acids and lower to bases. This condition applies in contrast to pure PVDF membranes. Despite having moderate chemical resistance, PEI/PVDF membranes have excellent characteristics and separation performance compared to pure membranes. This demonstrates its promising potential for separation of soluble metal salts and sucrose produced by various industrial processes compared to PVDF and PEI membranes.

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Section: F Chemical Resistancesupporting

confidence: 92%

Development of a New Polymer Membrane: Polyvinylidene fluoride/Polyetherimide Blend Membrane

Kusumawati

Santoso

Wibawa

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…This reaction causes an expulsion of HF and the formation of C=C double bonds or crosslinking between chains, similar to the thermal degradation reaction (see Figure 11 ). These conjugated double bonds allow further reaction mechanisms to occur, e.g., Diels–Alder [ 267 ] or further crosslinking [ 268 , 269 ]. The dehydrofluorination degradations visually appear as a colour change to yellow or brown, concurrent with the C=C double bond formation, but can also present as the gelation of a PVDF solution due to the formation of crosslinks between adjacent PVDF chains (see Figure 11 ).…”

Section: Pvdf Stabilitymentioning

confidence: 99%

On the Solubility and Stability of Polyvinylidene Fluoride

et al. 2021

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This literature review covers the solubility and processability of fluoropolymer polyvinylidine fluoride (PVDF). Fluoropolymers consist of a carbon backbone chain with multiple connected C–F bonds; they are typically nonreactive and nontoxic and have good thermal stability. Their processing, recycling and reuse are rapidly becoming more important to the circular economy as fluoropolymers find widespread application in diverse sectors including construction, automotive engineering and electronics. The partially fluorinated polymer PVDF is in strong demand in all of these areas; in addition to its desirable inertness, which is typical of most fluoropolymers, it also has a high dielectric constant and can be ferroelectric in some of its crystal phases. However, processing and reusing PVDF is a challenging task, and this is partly due to its limited solubility. This review begins with a discussion on the useful properties and applications of PVDF, followed by a discussion on the known solvents and diluents of PVDF and how it can be formed into membranes. Finally, we explore the limitations of PVDF’s chemical and thermal stability, with a discussion on conditions under which it can degrade. Our aim is to provide a condensed overview that will be of use to both chemists and engineers who need to work with PVDF.

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“…Van Goethem, Mertens, and Vankelecom (2019) developed a NF membrane via one‐pot synthesis and cross‐linking reaction of poly(vinylidene difluoride) [PVDF]. The cross‐linking reaction decreased PVDF crystallinity and thus deteriorated the thermal and mechanical stability of NF membrane.…”

Section: Physical Treatmentmentioning

confidence: 99%