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Type: Artigo de periódico
Title: Detection of residual acidic groups in several poly(N-alkyl methacrylate)s using photophysical and photochemical probes
Author: Christoff, M
Yamaki, SB
de Oliveira, MG
Atvars, TDZ
Abstract: This work describes three different methods for detecting acidic groups copolymerized in poly(methyl methacrylate), poly(ethyl methacrylate), and poly(n-butyl methacrylate) chains using molecular spectroscopy. The first was based on the shift of the tautomeric equilibrium of 4-dimethylaminoazobenzene by acidic groups that modify the absorption band in the UV/vis spectra. We also show that the acidic groups present in the polymer influenced the anti-syn photoisomerization reaction of this dye. Further, a mercury-dithizonate complex was completely bleached when sorbed in poly(n-alkyl methacrylate) matrices containing acidic groups. Finally, Nile Blue A was used as a spectrophotometric probe to quantify the amount of acidic groups in these polymers. (C) 2004 Wiley Periodicals, Inc.
Subject: poly(n-alkyl methacrylate)s
acidic groups
Nile Blue A
mercury dithizonate
Country: EUA
Editor: John Wiley & Sons Inc
Rights: fechado
Identifier DOI: 10.1002/app.20022
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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