Abstract
Sulfonated polyimides (SPIs)/silica composite membranes were prepared via an in situ sol–gel reaction followed by solution casting. SPIs based on 1,4,5,8-naphthalene tetracarboxylic dianhydride, 4,4'-diaminodiphenyl ether-2,2'-disulfonic acid and 4,4'-diaminodiphenyl ether have been chosen for the preparation of composite membranes due to their relatively high hydrolytic stability. Membranes varying in degree of sulfonation as well as silica content were characterized by FT-IR spectroscopy, thermal gravimetric analysis, transmission electron microscopy and impedance spectroscopy. It was found that the thermal and hydrolytic stability of membranes was enhanced by silica particles. Based on the morphological and conductivity data it is suggested that formation of a hydrogen bonded network of silanol groups of silica nanoparticles and sulfonic acid groups of the polymer matrix enhances the proton conductivity via the hopping mechanism of proton transport.
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Funding
The authors greatly thank the Ministry of Science and Higher Education of the Russian Federation (contract no. 05.605.21.0188 from 3 December 2019 (RFMEFI60519X0188)) for financial support.
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Gupta, M., Zhu, X., Melnikov, A.P. et al. Sulfonated Polyimide–Silica Composite Membranes: Preparation, Morphology and Proton Conductivity. Nanotechnol Russia 15, 778–784 (2020). https://doi.org/10.1134/S1995078020050043
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DOI: https://doi.org/10.1134/S1995078020050043