pH-stability of Layer-by-layer thin films composed of carboxyl-terminated poly (amidoamine) dendrimer and poly (acrylic acid)

Shigeru Tomita, Katsuhiko Sato, Jun Ichi Anzai

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Layer-by-layer (LbL) thin films were prepared using carboxyl-terminated poly (amidoamine) dendrimers (generation, 3.5) (PAMAM-COOH) and poly (acrylic acid) (PAA). The stability of the LbL films in aqueous media was evaluated as a function of pH of the media. The PAMAM-COOH-PAA films were stable at pH 2.0-4.5, while the films were decomposed in the solutions of pH 1.5 and pH 5.0-7.0. The pH-stability of the PAMAM-COOH-PAA films was discussed on the basis of the dissociation equilibrium of carboxylic acid residues in PAA and was compared with pH-stability of poly (methacrylic acid) (PMA)-based LbL films. The stability of the PAMAM-COOH-PAA films was different from that of PAMAM-COOH-PMA film. The difference was rationalized based on the acidity of PAA being stronger than that of PMA.

Original languageEnglish
Pages (from-to)75-78
Number of pages4
JournalKOBUNSHI RONBUNSHU
Volume66
Issue number2
DOIs
Publication statusPublished - 2009 Feb

Keywords

  • Dendrimer
  • Hydrogen bond
  • Layer-by-layer film
  • Poly (acrylic acid)
  • pH-stability

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

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