Smart aqueous reaction medium

Martin Davies, Estelle Stringer

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Smart materials show a nonlinear response to a stimulus. In aqueous solution, the reactions between methyl p-tolyl sulfide and peroxomonosulfate or m-chloroperbenzoic acid show the expected linear dependence of the logarithm of the measured rate constant on the reciprocal temperature. This constitutes Arrhenius behavior. In the presence of 5 or 15 g L-1 of the thermoresponsive poloxamer, P104, H(OCH2CH2)27(OCH(CH3)CH2)61(OCH2CH2)27OH, which forms micelles as the temperature is increased, anti-Arrhenius behavior or hyper-Arrhenius behavior is observed. Anti-Arrhenius behavior occurs when the organic sulfide partitions into the thermally induced poloxamer micelles while the peroxomonosulfate anion remains in the bulk aqueous phase, causing a decrease in rate. Hyper-Arrhenius behavior occurs when both the organic sulfide and the m-chloroperbenzoic acid partition into the thermally induced micelles, causing a much greater increase in rate with temperature than in the absence of poloxomer. These two different types of smart behavior of aqueous P104 are discussed.
Original languageEnglish
JournalLangmuir
DOIs
Publication statusPublished - Jan 2003

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