TY  - JOUR
SP  - 797
PB  - Nature Publishing Group, untuk SPSJ
AV  - public
Y1  - 2012/10/01/
VL  - 45
ID  - repounp38585
KW  - Polymer electrolyte membranes
KW  -  Radiation grafting
KW  -  Small-angle neutron scattering
TI  - Nanoscale Structures of Radiation-Grafted Polymer Electrolyte Membranes Investigated via a Small-Angle Neutron Scattering Technique
N2  - The nanoscale structures of graft-type polymer electrolyte membranes (PEMs), prepared by radiation-induced graft polymerization (grafting) of styrene onto poly(ethylene-co-tetrafluoroethylene) (ETFE) films followed by sulfonation, were investigated using a small-angle neutron scattering (SANS) technique. For comparison, SANS measurements were also performed on two precursor materials, the original ETFE film and polystyrene (PS)-grafted films. The SANS profiles of the grafted films showed shoulder peaks at a d-spacing of ?30?nm, which were attributed to the PS grafts introduced into the amorphous phases between the ETFE lamellar crystals. This grafting would result in the construction of a stack structure with alternating ETFE crystalline and PS-grafted layers as a repeating unit. In the ETFE PEMs, the spacing of the PS sulfonic acid (PSSA) grafts and ETFE crystals increased because the graft regions were enlarged by the volume of the attached sulfonic acid groups. Interestingly, the graft/crystal stack spacing in the PEMs did not increase from the dry- to fully-hydrated states. This finding implies restricted water absorption in the PSSA grafts between the ETFE lamellar crystals. In other words, most of the PSSA grafts introduced outside of the lamellae were considered to be hydrated and to act as proton conduction pathways.
EP  - 801
UR  - https://www.nature.com/articles/pj2012218
JF  - Polymer Journal
A1  - Sawada, Shin-ichi
A1  - Yamaguchi, Daisuke
A1  - Putra, Ananda
A1  - Koizumi, Satoshi
A1  - Maekawa, Yasunari
SN  - Print: 0032-3896 dan Online: 1349-0540
ER  -