Producing 'self-plasticizing' ion-selective membranes

Yook Heng Lee, Elizabeth A H Hall

Research output: Contribution to journalArticle

116 Citations (Scopus)

Abstract

Polymer membranes have been explored for the analysis of ions that do not require plasticizers and with photocurable properties. This work was focused on investigating the viability of the methacrylic-acrylic copolymers as new self-plasticizing membrane matrixes for ion-selective electrodes or other ion-sensor applications. Copolymers with glass transition temperatures ranging from -20 to -44 °C could be prepared without added plasticizer and were found to be functional as ion-selective membranes. Both free-radical solution polymerization and photopolymerization could be used, and 'self- plasticizing' behavior of copolymers was observed with a high alkylacrylate (R = C4) content. This was found to be compatible with most commercially available ionophores, and sensors for potassium, sodium, calcium and pH were fabricated entirely by photocure procedures; single-step procedures for the immobilization of benzo-15-crown-5 ionophore on these self-plasticizing copolymer matrixes were also developed. Even though the ionophore was immobilized, potentiometric studies revealed that the ionophore remained functional, and thus, these copolymers have the advantage of suffering neither leaching of ionophore nor plasticizers. All these sensors exhibited a Nernstian or near Nernstian response with selectivity comparable to plasticized PVC membranes or other plasticized and photocurable polymer membranes. The long-term response of the potassium sensor with immobilized ionophore and the sodium sensor showed little deterioration for as long as one month and three months, respectively, under continuous use.

Original languageEnglish
Pages (from-to)42-51
Number of pages10
JournalAnalytical Chemistry
Volume72
Issue number1
DOIs
Publication statusPublished - 1 Jan 2000

Fingerprint

Ion selective membranes
Ionophores
Copolymers
Plasticizers
Sensors
Membranes
Sodium Ionophores
Potassium
Polymers
Ions
Photopolymerization
Polyvinyl Chloride
Leaching
Acrylics
Free Radicals
Deterioration
Sodium
Polymerization
Calcium

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Producing 'self-plasticizing' ion-selective membranes. / Lee, Yook Heng; Hall, Elizabeth A H.

In: Analytical Chemistry, Vol. 72, No. 1, 01.01.2000, p. 42-51.

Research output: Contribution to journalArticle

Lee, Yook Heng ; Hall, Elizabeth A H. / Producing 'self-plasticizing' ion-selective membranes. In: Analytical Chemistry. 2000 ; Vol. 72, No. 1. pp. 42-51.
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