Influence of Methacrylic-Acrylic Copolymer Composition on Plasticiser-free Optode Films for pH SensorsReportar como inadecuado




Influence of Methacrylic-Acrylic Copolymer Composition on Plasticiser-free Optode Films for pH Sensors - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

School of Chemical Sciences & Food Technology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia





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Abstract In this work we have examined the use of plasticiser-free polymeric films incorporating a proton selective chromoionophore for optical pH sensor. Four types of methacrylic-acrylic copolymers containing different compositions of n-butyl acrylate nBA and methyl methacrylate MMA were synthesised for use as optical sensor films. The copolymers were mixed with appropriate amounts of chromoionophore ETH5294 and a lipophilic salt before spin coated on glass slides to form films for the evaluation of pH response using spectrophotometry. Co-polymer films with high nBA content gave good response and the response time depended on the film thickness. A preliminary evaluation of the optical films of high nBA content with pHs from 2 - 14 showed distinguishable responses from pH 5 - 9. However, the adhesion of the pH sensitive film was good for copolymers with higher content of MMA but not for films with high nBA.

Keywords: Optical pH sensor; Methacrylic-acrylic films; Chromoionophore; Plasticiserfree Optical pH sensor; Methacrylic-acrylic films; Chromoionophore; Plasticiserfree





Autor: Lee Yook Heng *, Teh Huey Fang, Loh Han Chern and Musa Ahmad

Fuente: http://mdpi.com/



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