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To explore a new blowing agent for polyurethanes (PUs), palmitic acid was grafted onto a branched polyethyleneimine (bPEI; weight‐average molecular weight = 25,000 Da) via N,N′‐carbonyldiimidazole condensation to form a hydrophobically modified bPEI [palmitic acid grafted branched polyethyleneimine (C16–bPEI)] with a grafting rate of 12%. A CO2 adduct of C16–bPEI, which trapped 16.8% CO2 in it, was...
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