Chitosan-Sulfated Titania Composite Membranes with Potential Applications in Fuel Cell: Influence of Cross-Linker Nature

Polymers

Ada Sacc๠ AdrianaT. Marinoiu²  Corneliu Cojocaru³  Petrisor Samoila³  Valeria Harabagiu³  Andra-Cristina Humelnicu³  Mihai Asandulesa³  Adrian Bele³ 

[1] National Research Council of Italy, Institute for Advanced Energy Technologies “Nicola Giordano” (CNR-ITAE), via S. Lucia sopra Contesse 5, 98126 Messina, Italy;National Research and Development Institute for Cryogenics and Isotopic Technologies—ICSI Rm, Valcea, 240050 Ramnicu Valcea, Romania;“Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, 700487 Iasi, Romania;

关键词: chitosan;    sulfated titania;    cross-linking;    polyelectrolyte composite membranes;   

DOI  :  10.3390/polym12051125

来源: DOAJ

【 摘 要 】

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 × 10⁻³ S/cm and 6.2 × 10⁻³ S/cm, as determined at 60 °C by dielectric spectroscopy and the four-probes method, respectively.

【 授权许可】

Unknown