Association of Copolymer Acrylic Acid/Methyl-acrylic acid/Butyl Acrylate in Aqueous Solution

Abstract

Abstract: The associations of triblock copolymer made of acrylic acid, methyl-acrylic acid and butyl acrylate in aqueous solution as well as in NaCl and CaCl₂ solutions were studied by using fluorescence. The micelle-like clusters(MLCs) of copolymer formed is able to solubilize non polar material. Alittle electrolytes added in the copolymer solution can increase the value of critical aggregation concentration( ρ_ac ) and micropolarity. But with the increase of the concentration of electrolytes, the value of ρ_ac and micropolarity will decrease. When there is NaCl with fixed concentration in the systems, the process of the MLCs loosening is relaxed because of the charge-screening. In the systems with fixed CaCl₂ concentration, Ca ²⁺ induced the cross-link of -COO^-groups, so the interface between the MLCs and the water is not obvious and the big MLCs is formed between the clusters.

Key words: Copolymer, Micelle like clusters(MLCs), Fluorescence probe, Micropolarity

CLC Number:

O631

TrendMD:

XU Gui-Ying, YANG Yan-Lian, YUAN Shi-Ling, CHEN Ai-Min, ZHENG Li-Qiang . Association of Copolymer Acrylic Acid/Methyl-acrylic acid/Butyl Acrylate in Aqueous Solution[J]. Chem. J. Chinese Universities, 2001, 22(9): 1567.

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Association of Copolymer Acrylic Acid/Methyl-acrylic acid/Butyl Acrylate in Aqueous Solution

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