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Heat inhibited reactions.

D Martin Davies1, Estelle L Stringer

  • 1Division of Chemical Sciences, School of Applied Sciences, Northumbria University, Newcastle upon Tyne, UK NET 8ST. martin.davies@unn.ac.uk

Chemical Communications (Cambridge, England)
|February 15, 2003
PubMed
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The rate of acyl transfer to hydrogen peroxide decreases with increasing temperature in amphiphilic triblock copolymer solutions. This occurs because the hydrophobic ester moves into micelles formed by the copolymer at higher temperatures.

Area of Science:

  • Polymer Chemistry
  • Physical Chemistry
  • Biophysical Chemistry

Background:

  • Amphiphilic triblock copolymers self-assemble in aqueous solutions to form micelles.
  • These micelles can alter the local environment for chemical reactions.
  • Temperature changes can influence micelle formation and stability.

Purpose of the Study:

  • To investigate the effect of temperature on acyl transfer reactions in the presence of amphiphilic triblock copolymers.
  • To understand the role of copolymer micelles in modulating reaction kinetics.

Main Methods:

  • Kinetic studies of acyl transfer from p-nitrophenyl trimethylacetate to hydrogen peroxide.
  • Utilizing millimolar aqueous solutions of poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymers.

Related Experiment Videos

  • Varying the temperature to observe changes in reaction rates.

    • Main Results:

    • Acyl transfer reaction rate decreases as temperature increases.
    • Hydrophobic partitioning of the ester into heat-induced micelles was observed.
    • The copolymer structure and temperature-dependent micellization influence reaction kinetics.

    Conclusions:

    • Temperature-induced micellization of amphiphilic triblock copolymers affects acyl transfer reaction rates.
    • The partitioning of hydrophobic substrates into micelles can inhibit reactions.
    • This study highlights the interplay between polymer self-assembly and chemical reactivity.