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<p>To assess the factors influencing the catalytic action of the Pluronic F127 and Synperonic F68 triblock copolymers in the alkaline hydrolysis of <i>O</i>-alkyl-<i>O</i>-<i>p</i>-nitrophenyl chloromethyl phosphonates, the self-organization in polymer solutions was studied. The critical micelle concentration and size of the aggregates were determined. The kinetic dependencies of the reaction in micellar solutions of the polymers were obtained under pseudo-first-order conditions and analyzed within the framework of a pseudophase model of micellar catalysis. In the system based on Pluronic F127, hydrolysis is inhibited by up to 6.5 times. In the case of Synperonic F68, the micellar effect is temperature-dependent: at 25 °C, the reaction rate remains unchanged, while at 40 °C, a slight inhibition to 1.5 times is observed. This difference is likely attributed to the distinction in the aggregation behavior of the polymers under these conditions.</p>

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Supramolecular systems based on triblock copolymers: temperature control of self-organization and micellar effect in the hydrolysis of phosphorus acid esters

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • F. G. Valeeva,
  • G. A. Gaynanova,
  • E. A. Vasilieva,
  • L. A. Vasileva,
  • L. Ya. Zakharova

摘要

To assess the factors influencing the catalytic action of the Pluronic F127 and Synperonic F68 triblock copolymers in the alkaline hydrolysis of O-alkyl-O-p-nitrophenyl chloromethyl phosphonates, the self-organization in polymer solutions was studied. The critical micelle concentration and size of the aggregates were determined. The kinetic dependencies of the reaction in micellar solutions of the polymers were obtained under pseudo-first-order conditions and analyzed within the framework of a pseudophase model of micellar catalysis. In the system based on Pluronic F127, hydrolysis is inhibited by up to 6.5 times. In the case of Synperonic F68, the micellar effect is temperature-dependent: at 25 °C, the reaction rate remains unchanged, while at 40 °C, a slight inhibition to 1.5 times is observed. This difference is likely attributed to the distinction in the aggregation behavior of the polymers under these conditions.