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Proceedings Paper

Polymer film doped with a solvatochromic dye for humidity measurement
Author(s): Marju Kleemann; Artur Suisalu; Jaak Kikas
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Paper Abstract

A humidity sensitive membrane with a good linearity and sensitivity was fabricated. Its moisture sensitivity is based on the hyperchromic effect and the hypsochromic shift in the absorption spectrum of poly(methy1 methacrylate) (PMMA) doped with a solvatochromic Reichardt's betaine dye. A 20-μm-thick self-standing film exhibited a good linearity in the absorbance dependence on the humidity at the wavelength of 667 nm and the humidity level sensitivity to within 0.002%. The membrane had similar reaction rates for the sorption and desorption of moisture without any hysteresis. The conventional dual-mode gas sorption model is applicable to describe water dynamics in glassy PMMA. From the analysis of the temperature dependent sorption data, the activation energy of the diffusion coefficient ΔE = 53 kJ/mol and the enthalpy of the water sorption in PMMA ΔHs = 22 kJ/mol have been estimated.

Paper Details

Date Published: 12 June 2006
PDF: 7 pages
Proc. SPIE 5946, Optical Materials and Applications, 59460N (12 June 2006); doi: 10.1117/12.639189
Show Author Affiliations
Marju Kleemann, Univ. of Tartu (Estonia)
Artur Suisalu, Univ. of Tartu (Estonia)
Jaak Kikas, Univ. of Tartu (Estonia)

Published in SPIE Proceedings Vol. 5946:
Optical Materials and Applications
Arnold Rosental, Editor(s)

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