The Dissolution Mechanism of Polyelectrolyte Complex in Surfactant Aqueous Solution

Abstract

Abstract: Polyelectrolyte complex formed from diazoresin(DR) as cationic polyelectrolyte and alkaline hydrolysate of styrenemaleic anhydride copolymer(PSMNa) as anionic polyelectrolyte does not dissolve in water or organic solvents due to its ionic crosslinking structure. It was found that the solubility of this complex was greatly enhanced in aqueous solution of sodium dodecyl sulfate(SDS). The solubility of DR-PSMNa complex in0.1 mol/Land 0.15 mol/L SDSaqueous solution was determined to be 0.024 g/mLand 0.033 g/mLrespectively. It was also confirmed that the complex from DR and SDS, which does not dissolve in water, can also dissolve in SDSaqueous solution. The decomposition temperature(T_d) of diazonium groups for different complexes was determined by DSCand shows that the T_dof DR-PSMNa after dissolution in SDSaqueous solution changes to 146 ℃ from the original value of 133 ℃. It was proposed that during the dissolution of PECin surfactant aqueous solution, the complex is separated to its two components via the interaction between PECand surfactant molecules at first, then the components dissolve in water.

Key words: Polyelectrolyte complex, Surfactant, Thermodecomposition temperature, Hydrophobic interaction

CLC Number:

O631

TrendMD:

LUO Hao, ZHENG Xiao-Liang, CAO Wei-Xiao. The Dissolution Mechanism of Polyelectrolyte Complex in Surfactant Aqueous Solution[J]. Chem. J. Chinese Universities, 2000, 21(2): 321.

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The Dissolution Mechanism of Polyelectrolyte Complex in Surfactant Aqueous Solution

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