Spectroscopic evidence and mechanistic insights on dehydrofluorination of PVDF in alkaline medium

Structural Characterization and Physicochemical Properties of Functionally Porous Proton-Exchange Membrane Based on PVDF-SPA Graft Copolymers

“…The chemical modification of PVDF to prepare membranes was achieved as follows: first, dehydrofluorination of PVDF in a basic medium [ 31 ] led to a PVDF-containing double bond in the backbone (D-PVDF). Such a double bond could react with 3-sulfopropyl acrylate (SPA) and 1H, 1H, 2H-perfluoro-1-hexene (PFH) under radical initiation to lead to the membranes [ 43 ]. Figure 1 illustrates the reaction steps and synthetic strategy adopted for PEMs’ fabrication.…”

“…The peaks are broadened due to the small lateral crystal size (5–6 nm). The SAXS curve for the PEM-RCF-2 membrane, as shown by the red line in Figure 4 b, exhibits a significant peak L 1 = Lc + La = 7.9 nm, characteristic of the lamellar stacking in PVDF which includes alternating crystalline ( Lc ) and amorphous ( La ) layers [ 42 , 43 ]. The absence of this peak in PEM-RCF, indicated by the red line in Figure 4 a, suggests a less ordered structure, potentially enhancing the membrane’s transport properties since proton transport predominantly occurs through the amorphous regions.…”

“…The dehydrofluorination of polyvinylidene fluoride (PVDF) was carried out using the previous reported method [ 43 ]. In brief, a 10 w / v % of vacuum-dried PVDF powder was prepared in a DMAc solvent.…”

“…3-sulfopropyl acrylate potassium salt (SPA) and 1H, 1H, 2H-Perfluoro-1-hexene (PFH) and to synthesize the desired copolymers. The dehydrofluorination of polyvinylidene fluoride (PVDF) was carried out using the previous reported method [43]. In brief, a 10 w/v % of vacuum-dried PVDF powder was prepared in a DMAc solvent.…”

Aryl ether-free polymer electrolytes for electrochemical and energy devices

“…73,74 However, under high pH conditions, the PVDF backbone composed of difluoroethane, rapidly degrades through dehydrofluorination (1,2-HF elimination) and subsequent oxidation reactions (Scheme 5a). 75,76…”