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STUDY ON NANOHOLE STRUCTURE – GAS PERMEATION RELATIONSHIP OF GRAFT-TYPE POLYMER ELECTROLYTE MEMBRANE FOR FUEL CELL APPLICATION Nguyen Hoang Anh 1, * , Tran Duy Tap 1 , Huynh Thi Hai 1 , Chau Van Tao 1 , Luu Anh Tuyen 2 , Do Duy Khiem 2 , Nguyen Quoc Hien 3 1 University of Science Ho Chi Minh City, 227 Nguyen Van Cu, District 5, HCMC 2 Center for Nuclear Techniques HCMC, 217 Nguyen Trai, District 1, HCMC 3 Research and development center for radiation technique, 202A Street 11, Linh Xuan Ward, Thu Duc, Ho Chi Minh City * Email: nghanh@hcmus.edu.vn Poly(styrenesulfonic acid)-grafted poly(ethylene-co-tetrafluoroethylene) (ETFE) polymer electrolyte membranes (ETFE-PEM) were prepared by gamma irradiation-induced graft polymerization of styrene into ETFE films (grafted-ETFE) and subsequent sulfonation of the grafted films. The nanohole structure-gas permeation relationship of ETFE-PEM with a wide variation of the grafting degree (GD) of 0 127% was investigated using positron annihilation lifetime spectroscopy (PALS) in comparing with those of the precursor pristine ETFE and grafted-ETFE films. The PAL spectra of all films and membranes indicated the existence two oPs components corresponding to the order of the nanohole volumes from the smaller (V3) to the larger (V4). The V3 (0.044 0.075 nm 3 ) and V4 (0.17 0.26 nm 3 ) values of grafted-ETFE films is only slightly higher than those of ETFE-PEMs indicating that the nanohole structures of memrbanes were formed and mainly affected during graft polymerization, but not sulfonation process. Because the V3 values are threeor four times lower than those of V4 for both graftedETFE films and membranes in the entire GD, the gas permeation was predicted to pass primarily through the ETFE-PEM amorphous regions containing polystyrene/polystyrenesulfonic acid grafts. When GD increased, the V4 values decreased, leading to the declining of gas permeation through membranes and thus, maintaining high chemical durability for fuel cell application.

NGHIÊN CỨU MỐI LIÊN HỆ CẤU TRÚC RỖNG NANO - SỰ THẨM THẤU KHÍ CỦA MÀNG GHÉP MẠCH ĐIỆN CỰC POLYMER SỬ DỤNG CHO PIN NHIÊN LIỆU