Micelles Behavior of P(Styrene-b-acrylic acid) Block Copolymer at Different pH and Calcium Ion Concentration

Abstract

Abstract: The micelles behavior of amphiphilic block copolymer P(Styrenebacrylic acid), in aqueous solvent was studied by dynamic light scattering and TEMtechniques. The diameters of micelle decreased and then increased with the decrease of the pHof the solution, and the similar phenomenon was also detected with the increase of the concentration of the calcium ion. Without added acid, the micelles were small spheres of low polydispersity with an average diameter 48 nm. When the value of pHwas less than₂, the micelles were unstable. It was found that the Ca²⁺ was linked with the carboxyl in the same micelle when the concentration of the CaCl₂ was less than₀.2 mg/mL. The diameter of micelle was smaller than the one without Ca²⁺. The Ca²⁺ was linked with the carboxyl between the different micelles when the concentration of the CaCl₂ was more than₀.5 mg/mLand the micelle was unstable. The diameters of micelles(from 37 nm to 100 nm) can be controlled by adding an appropriate concentration of CaCl₂ between₀.2₀.5 mg/mL.

Key words: Amphiphilic, P(Styrenebacrylic acid), Micelle, Ca²⁺

CLC Number:

O631

TrendMD:

DU ManQuan, SHI LinQi, AN YingLi, HE BingLin . Micelles Behavior of P(Styrene-b-acrylic acid) Block Copolymer at Different pH and Calcium Ion Concentration[J]. Chem. J. Chinese Universities, 2001, 22(12): 2120.

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Micelles Behavior of P(Styrene-b-acrylic acid) Block Copolymer at Different pH and Calcium Ion Concentration

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