The Mechanism of Thermal Decomposition of DDS and DR in Aqueous Solution Delayed by SDS

Abstract

Abstract: The thermal decomposition of diphenylamine diazonium salt(DDS) as the model compound and diazoresin(DR) in aqueous solution of sodium dodecyl sulfate (SDS) was investigated. The results show that the increasing of thermal stability of DDSand DRin SDSaqueous solution is ascribed to the participating of them into the premicelle or micelle of SDSvia the hydrophobic interaction as well as electrostatic attraction between DDS(or DR) and SDS. As a result, the diazonium groups of DDS(or DR) are protected by SDSagainst thermal decomposition. It is also confirmed that the thermal stability of DDSor DRis related closely to the concentration of SDSand salt(NaCl) existing in solution and increases with increasing [SDS] and [NaCl]. It is a reality that the more participation of DDS(or DR) into premicelle or micelle, the more thermal stability of DDS(or DR). Thus, the premicelle form at a low concentration of SDS(≈1×10^-5 mol/L) and exert the protection of DDR(or DR) towards thermal decomposition.

Key words: Diphenylamine-4-diazonium salt, Diazoresin, Sodium dodecyl sulfate, Thermal decomposition

CLC Number:

O631

TrendMD:

YANG Bo-Xuan, CAO Wei-Xiao  . The Mechanism of Thermal Decomposition of DDS and DR in Aqueous Solution Delayed by SDS[J]. Chem. J. Chinese Universities, 2000, 21(6): 969.

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The Mechanism of Thermal Decomposition of DDS and DR in Aqueous Solution Delayed by SDS

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