Article Dans Une Revue Journal of Polymer Science Part A: Polymer Chemistry Année : 2006

Amphiphilic diblock star polymer catalysts via atom transfer radical polymerization

Résumé

Diblock star polymers were synthesized via atom transfer radical polymerization from a palladium porphyrin macroinitiator. The arms of the star polymers had an amphiphilic design, with the central Pd-porphyrin surrounded by a relatively hydrophobic block of poly(butyl acrylate) and terminated by a hydrophilic block of poly(oligoethyleneglycol monomethylether monomethacrylate). The size of both the interior and exterior blocks of the polymer arms were tuned over a wide range of molecular weights with the exterior block used to solubilize the stars in polar media. The star polymers showed enhanced reactivity in the oxidation of 2-furaldehyde relative to a small molecule porphyrin, suggesting that the polymer backbone aids with catalytic turnover. Oxygen diffusion studies indicate that the polymer backbone shields the porphyrin excited state from oxygen quenching. Shielding is independent of molecular weight and polymer composition, but it is not pronounced enough to retard the rate of singlet oxygen generation under preparative photooxidation conditions.

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Dates et versions

hal-04118992 , version 1 (06-06-2023)

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Citer

William Dichtel, Kyung-Youl Baek, Jean Fréchet, Ivo Rietveld, Sergei Vinogradov. Amphiphilic diblock star polymer catalysts via atom transfer radical polymerization. Journal of Polymer Science Part A: Polymer Chemistry, 2006, 44 (17), pp.4939-4951. ⟨10.1002/pola.21610⟩. ⟨hal-04118992⟩

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