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Type: Artigo de periódico
Title: Detection Of Residual Acidic Groups In Several Poly(n-alkyl Methacrylate)s Using Photopnysical And Photochemical Probes
Author: Christoff M.
Yamaki S.B.
De Oliveira M.G.
Atvars T.D.Z.
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. © 2004 Wiley Periodicals, Inc.
Rights: fechado
Identifier DOI: 
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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