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Based on previous endeavors on antimicrobial polyurethane (PU) foams and CO2‐releasing environment‐friendly blowing agents, we explored a series of modified polyethylenimine (PEI)–CO2 adducts, serving as both blowing and antimicrobial agents for PUs. For this purpose, a quaternary ammonium chain with a C12 alkyl (C12+), either alone or together with neutral (C8 and C12) alkyls, was grafted onto branched...
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