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摘要
En 中文
Smart materials show a nonlinear response to a stimulus. In aqueous solution, the reactions between methylp-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)(27)OH, 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.
Keyword:
TRIBLOCK COPOLYMERS
ACID
SURFACTANT
CATALYSIS
MICELLES
IODIDE
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期刊
IF:
3.9
论文数:
5.4W
被引数:
10.6W
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