Palladium-Catalyzed Synthesis of Hyperbranched Polar Functionalized Polyethylene with High Density Hydrophilic Groups AITranslate

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DOI：https://doi.org/10.1021/acsapm.3c01989

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The chain-walking polymerization (CWP) strategy is a promising concept for the convenient synthesis of hyperbranched polar functionalized polyethylene with unique properties. In this study, we synthesized and described a series of o-aryl monosubstituted dibenzosuberyl iminopyridine ligands containing benzocycloalkyl or naphthyl moieties as well as the corresponding Pd(II) complexes, in a highly efficient manner. The Pd(II) complexes catalyzed efficient ethylene chain walking polymerization to produce hyperbranched polyethylenes (HBPEs) with high molecular weights (Mn values up to 71.4 kg/mol). Notably, copolymerization of ethylene and methyl acrylate, catalyzed by iminopyridine Pd(II) complexes, resulted in successful polar functionalized HBPEs with high density hydrophilic groups (21.4 mol %) at the end of branching. The polar functionalized HBPEs resulting from the process are saponified or reduced to yield more hydrophilic polymers that can solubilize water-insoluble drug molecules.