Studies on Acrylamide-Dicyanodiamide Maeromer and Its Copolymer with Styrene(Ⅱ)——The Interactions of Copolymer with Methyl Orange and Its Homologue

Abstract

Abstract: The binding of amphiphilic copolymer P-M-St which consists of hydrophobic groups aiongs the mam chain and hydrophilic groups along the graft side chain and the condensation polymer of dicyanodiamide and formaldehyde D-Fwith methyl orange (MO) as well as the binding of P-M-St with MOhomologue ethyl orange (EO) and orange-W (Q-IV ) were studied thermodynamically by the method of equilibrium dialysis at 25,35,45℃ and 55℃.The equilibrium constant K₁ and △H,△S,△G were obtained.It has been found that the binding ability of P-M-St is stronger than that of D-Fsince the former contains hydrophobic groups.The binding ability of dyes with P-M-St is in the order; O-IV>EO>MO,i.e.,the larger the hydrophobic group in dyes,the stronger is the binding ability.When urea or methanol is added,the hydro-phobic interaction of copolymer and dyes is destroyed,resulting in weakening the polymer-dye binding.After dyes interact with polymers,the λ_max shifts to ultraviolet region.The stronger the hydrophobicity of environments in which dyes lie,the greater the displacement.

Key words: Amphiphilic copolymer, Methyl orange, Equilibrium dialysis, Thermodynamics, Binding

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ZANG Qing-Da, LI Zhuo-Mei. Studies on Acrylamide-Dicyanodiamide Maeromer and Its Copolymer with Styrene(Ⅱ)——The Interactions of Copolymer with Methyl Orange and Its Homologue[J]. Chem. J. Chinese Universities, 1992, 13(10): 1323.

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Studies on Acrylamide-Dicyanodiamide Maeromer and Its Copolymer with Styrene(Ⅱ)——The Interactions of Copolymer with Methyl Orange and Its Homologue

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