||In this study, PVDF was dehydrofluorinated using an alkaline treatment and modified using 4-vinylbenzyl chloride to prepare a PVDF-g-VBC copolymer. A solution of the PVDF-g-VBC copolymer was anion exchanged to introduce a quaternary ammonium group using a quaternary ammonium reaction. In addition, an ion exchange membrane was prepared using a casting method, and a PVDF-g-VBC ion exchange membrane was made by heat treatment. Raman and Fourier-transform infrared (FT-IR) spectroscopy were performed to elucidate the molecular structure. The water uptake (W.U), ion exchange capacity (IEC) and electrical resistance (E.R) of the membrane were measured using a weight method, titration, and LCR meter, respectively.