Parametric investigations on proton conducting membrane by radiation induced grafting of 4-vinylpyridine onto poly(vinylidene fluoride) and phosphoric acid doping

Abstract

Proton conducting membrane composed of grafted basic moiety doped with phosphoric acid (PA) was studied. The membrane denoted as PVDF-g-4-VP/PA was prepared by radiation induced grafting of 4-vinylpyridine (4-VP) onto poly(vinylidene fluoride) (PVDF) films followed by doping with PA. The effect of grafting conditions on the degree of grafting ( %) was investigated. The acid doping conditions ( %, time and PA concentration) were also investigated with respect to doping level. The grafted precursors and the acid doped membranes were characterized by means of Fourier transform infrared (FTIR), X-ray diffractometry (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and field emission scanning electron microscopy (FESEM). The membranes showed a thermal stability up to a temperature of ∼ 160 ∘ C, above which they undergo a multi-step degradation pattern due to decomposition of the protonated functions, poly(4VP) grafts and PVDF matrix, respectively. The proton conductivities of the membranes were found to increase with the increase in % ( doping level) and the temperature with a maximum proton conductivity of 62 mS cm −1 achieved at 100 ∘ C without any humidification. The results of the present study show that the prepared membrane has a potential to be proposed for operating polymer electrolyte membrane fuel cell above 80 ∘ C.

Polyvinylamine-Containing Adsorbent by Radiation-Induced Grafting of N-Vinylformamide onto Ultrahigh Molecular Weight Polyethylene Films and Hydrolysis for CO2 Capture

“…This observation is likely to be due to mutual annihilation of graft growing chains and homopolymerization of NVF monomer that leads an increase in the viscosity and subsequent reduction in the monomer diffusion. Similar decreasing trends in kinetics were obtained for grafting of 4-vinlypyridine and sodium styrene sulfonate onto poly­(vinylidene fluoride) (PVDF) films where the optimum time was found to be 4 h and 24 for these systems, respectively. , …”

“…Similar decreasing trends in kinetics were obtained for grafting of 4-vinlypyridine and sodium styrene sulfonate onto poly-(vinylidene fluoride) (PVDF) films where the optimum time was found to be 4 h and 24 for these systems, respectively. 25,26 3.2. Properties of the Grafted Samples.…”

Radiation-grafted materials for energy conversion and energy storage applications

“…These membranes exhibited electrochemical properties comparable with the radiation-grafted membrane based on ETFE films prepared under similar conditions [187]. The reaction parameters for grafting 4-VP and 1-VIm onto PVDF were optimised in comparison with the membrane prepared from ETFE film [188].…”

Preparation of Nano-SiO2/Al2O3/ZnO-Blended PVDF Cation-Exchange Membranes with Improved Membrane Permselectivity and Oxidation Stability

“…However, the hydrophobicity of PVDF is a growing problem: the appetency of organics for PVDF membranes leads to increased IEM resistance and membrane fouling, and increases the energy consumption of an IEM used in certain industries (such as the metallurgical industry) [16,17]. There are many methods that can be used for the modification of PVDF membranes, such as irradiation [18]. Currently, there are numerous reports on PVDF membrane modification by mixing the polymer with inorganic materials [7,19,20].…”