Taking the plasticizer out of methacrylic-acrylic membranes for k+-selective electrodes

Yook Heng Lee, Elizabeth A H Hall

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Methacrylic-acrylic copolymers that can be externally or internally plasticized were used to fabricate potassium ion-selective electrodes (ISE) with crown ethers as the potassium selective ionophores. Copolymers which required external plasticizer have higher methacrylate content and glass transition temperatures (T(g)) of approximately + 30 °C whereas the internally plasticized (self-plasticized) copolymer is high in acrylate with T(g) ≃ - 27 °C. Nonlipophilic crown ethers such as benzo-15-crown-5 and benzo-18-crown-6 could be included in the plasticized copolymers and yielded functional ISEs, but as with the plasticized PVC membranes these crown ethers tend to show some leaching which reduced the ISE lifetime; they were also incompatible with the 'self-plasticized copolymer', forming opaque membranes and electrodes of no potassium selectivity. In contrast, lipophilic crown ethers such as bis- or mono-nitrobenzo-15-crown-5 were found to be compatible with the self-plasticized copolymers yielding ISEs with good potassium ion selectivity, closely resembling plasticized PVC membrane based electrodes even though these new membranes contained no added plasticizer. This work has shown that it is possible to prepare ISEs based on nonplasticized methacrylic-acrylic polymers using lipophilized crown ethers to ensure compatibility with the polymer and deter leaching.

Original languageEnglish
Pages (from-to)187-193
Number of pages7
JournalElectroanalysis
Volume12
Issue number3
DOIs
Publication statusPublished - 2000

Fingerprint

Plasticizers
Crown Ethers
Crown ethers
Acrylics
Copolymers
Membranes
Electrodes
Potassium
Polyvinyl Chloride
Polyvinyl chlorides
Leaching
Polymers
Ionophores
Methacrylates
Ions

Keywords

  • Crown ether
  • Ion-selective electrode membrane
  • Methacrylate-acrylate
  • Plasticizer

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Taking the plasticizer out of methacrylic-acrylic membranes for k+-selective electrodes. / Lee, Yook Heng; Hall, Elizabeth A H.

In: Electroanalysis, Vol. 12, No. 3, 2000, p. 187-193.

Research output: Contribution to journalArticle

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