Preparation, characterization and methanol permeability of proton conducting membranes based on sulfonated ethylene-vinyl alcohol copolymer

Chih Hsiang Huang, Hsiu Mei Wu, Chi Chang Chen, Chia Wei Wang, Ping Lin Kuo

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Sulfopropylated ethylene-vinyl alcohol copolymers (s-EVOHs) have been synthesized via reacting 1,3-propanesultone with EVOH. Solution-cast membranes from the s-EVOH and its blend with EVOH of ethylene segment ratio of 44mol% (44E) were prepared. The results of FT-IR, wide angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC) showed that pendant sulfonic acid groups diminished the crystallinity of pristine EVOH. It was observed that these blend membranes showed lower swellability and methanol permeability with the increasing blending ratio of 44E. Small angle X-ray scattering (SAXS) further showed no nano-phase separation of ionic domain existed in the matrix, and solid-state 23Na NMR displayed the aggregates of ionic functionalities in the prepared membranes were smaller than those in Nafion. The highest proton conductivity of these membranes is 0.05S/cm at 30°C. The methanol permeability of the membranes ranges from 10-8 to 10-6cm2/s and is highly correlated with the bound water degree and the corresponding amount of hydroxyl groups in the matrix. An optimum amount of vinyl alcohol segments in ion channels will act as an effective methanol barrier without causing greater swelling ratio.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Membrane Science
Volume353
Issue number1-2
DOIs
Publication statusPublished - 2010 Mar 11

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Fingerprint Dive into the research topics of 'Preparation, characterization and methanol permeability of proton conducting membranes based on sulfonated ethylene-vinyl alcohol copolymer'. Together they form a unique fingerprint.

Cite this