1. In situ synthesis of star copolymers consisting of a <scp>polyhedral oligomeric silsesquioxane</scp> core and poly(2,5‐benzimidazole) arms for high‐temperature proton exchange membrane fuel cells
- Author
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Xujin Bao, Rong Zhang, Fang Luo, Xiao Li, Shengfei Hu, Tao Li, Qingting Liu, Xudong Fu, Yanhua Zhang, Jiayuan Min, Lanxin Li, and Feng Zhao
- Subjects
chemistry.chemical_classification ,Materials science ,Renewable Energy, Sustainability and the Environment ,020209 energy ,Energy Engineering and Power Technology ,Proton exchange membrane fuel cell ,02 engineering and technology ,Polymer ,021001 nanoscience & nanotechnology ,Silsesquioxane ,chemistry.chemical_compound ,Fuel Technology ,Monomer ,Membrane ,Nuclear Energy and Engineering ,chemistry ,Chemical engineering ,0202 electrical engineering, electronic engineering, information engineering ,Copolymer ,Molecule ,0210 nano-technology ,Phosphoric acid - Abstract
Star copolymers with good film-forming and mechanical properties were in situ synthesized for fabricating proton exchange membranes. The monomers of 3,4-diaminobenzoic acid were first grafted onto glycidyl-polyhedral oligomeric silsesquioxane (G-POSS) cores and then propagated to the poly(2,5-benzimidazole) (ABPBI) chains. The introduction of the star copolymer improves the movement of the ABPBI polymer chains, resulting in a lower internal viscosity and larger free volume that favor increased membrane flatness and absorbilities of water and phosphoric acid molecules, respectively. It was found that the star copolymers with 1.0 wt% of incorporated POSS (ABPBI-1.0POSS) had the best balance of the acid retentivity and film-forming property as well as mechanical properties that are desirable for proton exchange membranes without PA loss operating at high temperatures. The enhanced cell performance characteristics obtained using the ABPBI-1.0POSS-based membranes indicate that star copolymers are promising materials for use in high-temperature proton exchange membrane fuel cells.
- Published
- 2020
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