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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...
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