在非水溶剂中聚甲基丙烯酸甲酯及其甲基丙烯酸共聚物与Rh6G的相互作用

本文用乙酸乙酯与不同比例乙醇配成混合溶剂, 考察在不同极性的介质中, Rh_6G对聚甲基丙烯酸甲酯及其与甲基丙烯酸共聚物分子形态的影响, 以及聚合物对Rh_6G荧光强度的影响, 发现Rh_6G与聚甲基丙烯酸甲酯没有特殊相互作用, 而与共聚物的相互作用受溶剂的极性影响很大, 随着极性增加, 从氢键作用过渡到静电作用。

STUDY ON THE INTERACTION OF POLY (METHYL METHACRYLATE) AND ITS COPOLYMER OF METHYL METHACRYLIC ACID WITH Rh6G IN NON-AQUEOUS SOLUTION

The interaction of poly (methyl methacrylate) and its copolymer of methyl methacrylic acid with Rh6G in mixed solvent of ethyl acetate and ethyl alcohol with various proportions was studied. It was found that there did not exist any specific interaction between poly(methyl methacrylate) and Rh6G in all mixed solvent used. The case of copolymer was quite different. By addition of Rh6G the specific viscosity of copolymer in solvent of low alcohol content was enhanced and the polyelectrolyte effect of copolymer in solvent of high alcohol content was suppressed. The fluorescence intensity of Rh6G was decreased in presence of copolymer, especially in solvent of high alcohol content. All these experimental facts demonstrated there was interaction between copolymer and Rh6G. It was supposed the interaction was fulfilled through hydrogen bonding between Rh6G molecule and —COOH in low polar solvent and through electrostatic attraction mainly between the quaternary ammonium ion of Rh6G and —COO~- in high polar solvent.