期刊
POLYMERS
卷 12, 期 5, 页码 -出版社
MDPI
DOI: 10.3390/polym12051125
关键词
chitosan; sulfated titania; cross-linking; polyelectrolyte composite membranes
资金
- Romanian Ministry of Research and Innovation, CCCDI-UEFISCDI within PNCDI III [PN-III-P1-1.2-PCCDI-2017-0194/25PCCDI/2018]
Chitosan-sulfated titania composite membranes were prepared, characterized, and evaluated for potential application as polymer electrolyte membranes. To improve the chemical stability, the membranes were cross-linked using sulfuric acid, pentasodium triphosphate, and epoxy-terminated polydimethylsiloxane. Differences in membranes' structure, thickness, morphology, mechanical, and thermal properties prior and after cross-linking reactions were evaluated. Membranes' water uptake capacities and their chemical stability in Fenton reagent were also studied. As proved by dielectric spectroscopy, the conductivity strongly depends on cross-linker nature and on hydration state of membranes. The most encouraging results were obtained for the chitosan-sulfated titania membrane cross-linked with sulfuric acid. This hydrated membrane attained values of proton conductivity of 1.1 x 10(-3) S/cm and 6.2 x 10(-3) S/cm, as determined at 60 degrees C by dielectric spectroscopy and the four-probes method, respectively.
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