Structural influence of hydrophobic diamine in sulfonated poly(sulfide sulfone imide) copolymers on medium temperature PEM fuel cell
- Authors
- Lee, Kang Hyuck; Lee, So Young; Shin, Dong Won; Wang, Chenyi; Ahn, Sang-Hyun; Lee, Kee-Jung; Guiver, Michael D.; Lee, Young Moo
- Issue Date
- Mar-2014
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Medium temperature PEMFC; Polymer electrolyte membrane; Sulfonated polyimide
- Citation
- POLYMER, v.55, no.6, pp.1317 - 1326
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER
- Volume
- 55
- Number
- 6
- Start Page
- 1317
- End Page
- 1326
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/133989
- DOI
- 10.1016/j.polymer.2013.09.030
- ISSN
- 0032-3861
- Abstract
- Sulfonated poly(sulfide sulfone imide) copolymers containing flexible sulfide bond and six-membered imide ring were synthesized by random polycondensation. Two types of membranes were prepared by using sulfide (S-PSI) and sulfide sulfone (S-PSFI) based non-sulfonated diamines to investigate the effects of the hydrophobic component. IECw values were controlled to 1.51-1.94 meq g(-1) depending on the degree of sulfonation (DS) which was in the range of 50-80%. The membrane series showed good thermal stability up to 310 C and mechanical properties (tensile strength >30 MPa). Dimensional stabilities were excellent with 23-35% increases, even at 100 degrees C. Proton conductivities of membranes composed of different hydrophobic diamines display a relatively good correlation with water content and morphology. In fuel cell tests, the S-PSI60 membrane shows relatively high current density of 250 mA cm(-2) at 0.6 V and maximum power density of 175 mW cm(-2) at 120 degrees C, 35% RH, 1.5 atm.
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