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Home  >  Journal list  >  Polymer Journal  >  Vol.14  No.11 (1982)  >  pp.861-868

Polymer Journal
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Amphiphilic Copolymers Consisting of Vinylphenanthrene and Cationic Segments. Fluorescence Quenching by Amphiphilic Quenchers in Aqueous Media

Yotaro Morishima1), Tohru Tanaka1), Yoshihiro Itoh1) and Shun-ichi Nozakura1)
1) Department of Macromolecular Science, Faculty of Science, Osaka University

ABSTRACT:  Amphiphilic random copolymers were prepared by radical copolymerization of 9-vinylphenanthrene (VPh) and N-(N′,N′-dimethylaminopropyl)methacrylamide followed by quaternization with dimethyl sulfate. The related monomer model compound was also synthesized by quaternization of N-(N′,N′-dimethylaminoethyl)-3-phenanthrylacetamide with dimethyl sulfate. The copolymers with VPh mole fraction (fPh) up to about 0.47 were soluble in water. The fluorescence quenching of the copolymers in aqueous solution was compared with that of the model compound by using amphiphilic quenchers, N-methyl-N-(2-hydroxyethyl)aniline (MHEA) and N,N-di(2-hydroxyethyl)aniline (DHEA), and an anionic quencher, fumaric acid (FA). Hydrophobic association of MHEA and DHEA with the copolymers led to far more effective fluorescence quenching than the monomer model system. Electrostatic binding of FA with the copolymer also resulted in severe quenching of the fluorescence, while it was shown that a single charge on the monomer model is not sufficient to bind FA effectively to enhance the fluorescence quenching.

Amphiphilic Copolymers/ 9-Vinylphenanthrene/ 3-Methacryloylaminopropyltrimethylammonium Sulfate/ Fluorescence Quenching/ Hydrophobic Microdomain/ Hydrophobic Interaction/ Electrostatic Interaction

Published online: March 03, 2006
© Copyright, 2006 by The Society of Polymer Science, Japan



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