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A Study on Langmuir Monolayers of Methacrylate Homo- and Copolymers Derivatized with Disperse Red Dyes

Published online by Cambridge University Press:  10 February 2011

Anantharaman Dhanabalan ,
Débora Balogh ,
Carlos José Leopoldo Constantino ,
Antonio Riul Jr. ,
Osvaldo N. Oliveira Jr.  and
José A. Giacometti
Anantharaman Dhanabalan
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
Débora Balogh
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
Carlos José Leopoldo Constantino
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
Antonio Riul Jr.
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
Osvaldo N. Oliveira Jr.
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
José A. Giacometti
Affiliation:
Instituto de Física de São Carlos, Universidade de São Paulo, CP 369, 13560–970, [email protected]
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Abstract

We report on the organization of different disperse red dye derivatized methacrylate homo- and copolymers as Langmuir monolayers at the air-water interface. The monolayers were investigated using surface pressure and surface potential isotherms. Methacrylic homopolymers containing disperse red-1 (HPDR1) and disperse red-13 (HPDR13) and methacrylic copolymers with different mole percentages of the dye and hydroxyethyl spacer groups were synthesized and characterized. A comparison of the monolayer characteristics of HPDR1 and HPDR13 revealed the influence of the chlorine substitution in the aromatic ring of the dye. Studies with copolymers indicated a clear transition in the monolayer behavior with the change of mole percentage of the dye incorporated in the polymer. While copolymers with low dye content (up to about 5 mole%) presented an expanded monolayer, the copolymers containing higher dye content (12% and above) formed a condensed monolayer similar to that of the homopolymer. These results indicated the critical role of the dye component in the polymer chain in forming the monolayer at the air-water interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 488: Symposium J – Electrical, Optical & Magnetic Properties of Organic IV , 1997 , 927
Copyright
Copyright © Materials Research Society 1998

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