Influence of the radiation grafting conditions on the cross‐sectional distribution of poly(vinylbenzyl chloride) grafted polymer onto poly(tetrafluoroethylene‐co‐hexafluoropropylene) films

Abstract

Poly(vinylbenzyl chloride) (PVBC)-grafted poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) films were prepared as precursors for ion-exchange membranes with a radiation grafting technique. A scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) instrument was used to investigate the effects of the radiation grafting conditions on the distribution profiles of the grafts in the FEP-g-PVBC films because the properties of the ion-exchange membranes were largely affected not only by the degree of grafting (DOG) but also by the distribution of the graft chain. These results indicate that the distribution profile of the grafts largely depended on the grafting parameters, such as the solvent, monomer concentration, film thickness, and irradiation dose.

Thermal behavior of poly(vinylbenzyl chloride)‐grafted poly(ethylene‐co‐tetrafluoroethylene) films

“…The chloride group of a poly(vinylbenzyl chloride) (PVBC)‐grafted polymer film can be converted into ion‐exchange functional groups, such as sulfonic acid and phosphoric acid, which are generally used in cation‐exchange membranes, or into a quaternary amine group for anion‐exchange membranes . Previously, PVBC‐grafted fluoropolymer films were prepared using a radiation grafting method, and these grafted films were used as intermediates to produce poly(vinylbenzyl sulfonic acid) (PVBSA)‐grafted fluoropolymer ion‐exchange membranes . The resulting membranes showed a higher chemical stability than the PSSA‐grafted fluoroplymer membranes and a lower methanol permeability, as compared with the Nafion membrane, while maintaining suitable proton conductivity.…”

A study on the characterization of FEP-g-PVBSA membranes as polymer electrolytes for direct methanol fuel cells

“…In our pervious study, 26–28 it was demonstrated that a new polymer electrolyte, FEP- g -PVBSA membrane could be successfully prepared by simultaneous irradiation grafting of a vinylbenzyl chloride (VBC) monomer onto FEP film using γ-ray irradiation, 28 and subsequent chemical conversion processes for the introduction of a sulfonic acid group. 27 The sulfonic acid group of the membrane was designed to indirectly connect the benzene ring with a methylene spacer group, and this new structural change of the substitute showed a more enhanced chemical stability than the FEP- g -PSSA membranes.…”

Preparation of Poly(vinylbenzyl chloride)-grafted Fluoropolymer Films by Using Radiation Grafting Method

“…The TGA thermograms of the PVBC-grafted FEP, PFA, and ETFE films (with DOG 71%, DOG 75%, and DOG 81%, respectively) are shown in Figure 3 monomer, the radiation grafting is known to initially occur on the surface and then proceed into the inner part of the film by diffusing of the monomer through the grafted region. [20][21][22] The EDS profiles in Figure 4 show that the PVBC grafts are 폴리머, 제34권 제5호, 2010년…”