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Methoxy poly(ethylene glycol)–polyethylenimine–chitosan (mPEG–PEI–CS) was synthesized via chitosan conjugated with polyethylenimine and methoxy poly(ethylene glycol). The intermediates and final copolymer were characterized and confirmed by 1 H NMR and FT-IR spectra. mPEG–PEI–CS was water soluble and its intrinsic viscosity was 0.446dL/g. The contents of mPEG and PEI conjugated in the copolymer...
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