One-step synthesis of K+-selective methacrylic-acrylic copolymers containing grafted ionophore and requiring no plasticizer

Yook Heng Lee, Elizabeth A H Hall

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A main drawback in the application of ion sensors that are based on plasticized polymeric membranes is the problem of leaching of plasticizer and ionophore. Leaching problems can be critical in solid-state minidevices, e.g., ion-selective electrodes or optodes, where a thin ion sensing polymer film is often empolyed. To resolve such problems, we have designed simple methacrylic-acrylic copolymers that required no plasticizer and which include immobilized polymerizable but hydrophilic ionophores such as 4-acryloylamidobenzo-15-crown-5 (AAB 15C5) and 4-acryloylamidobenzo-18-crown-6 (AAB18C6) that would normally be susceptible to leaching from plasticized PVC membranes, were used as model ionophores for the immobilization studies. These crown compounds are attractive since they can be employed as a monomeric unit in the copolymer recipe and thus no additional synthesis or polymer modification is required. Copolymers suitable for ion-selective membrane application were synthesized by introducing more than 80 wt. % of n-butyl acrylate to yield copolymers of T(g)'s between 20 to - 30°C. The molecular weight distributions of these copolymers were M(w) < 50 000 Da and they contained 2 to 6 wt. % of immobilized crown ether ionophores. The 'self-plasticising' methacrylic-acrylic membranes formed with these acryloyl crown ethers demonstrated good potentiometric responses to potassium ion. In contrast, AAB15C5 and AAB18C6 entrapped in membranes in a more classical ion selective membrane recipe, even when a plasticizer was included, were still inferior in their response to those with membranes containing immobilized ionophores. The restricted mobility of the immobilized ionophores in these self-plasticizing polymer matrices did not appear to hinder the normal complexation behavior of these ionophores. This was inferred from the possible formation of the usual 2:1 and 1:1 ionophore-cation complexes of AAB15C5 and AAB18C6, respectively, in these new copolymer matrices.

Original languageEnglish
Pages (from-to)178-186
Number of pages9
JournalElectroanalysis
Volume12
Issue number3
DOIs
Publication statusPublished - 2000

Fingerprint

Ionophores
Plasticizers
Acrylics
Copolymers
Ion selective membranes
Leaching
Crown Ethers
Membranes
Crown ethers
Ions
Crown Compounds
Polymeric membranes
Molecular weight distribution
Complexation
Polymer matrix
Polyvinyl Chloride
Polymer films
Polyvinyl chlorides
Potassium
Cations

Keywords

  • Ion-selective electrode
  • Ionophore immobilization
  • Methacrylate-acrylate
  • Nonplasticized polymeric membranes
  • Polymerizable crown ethers

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

One-step synthesis of K+-selective methacrylic-acrylic copolymers containing grafted ionophore and requiring no plasticizer. / Lee, Yook Heng; Hall, Elizabeth A H.

In: Electroanalysis, Vol. 12, No. 3, 2000, p. 178-186.

Research output: Contribution to journalArticle

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