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Proceedings Paper

Investigation of water penetration in polystyrene by use of polymer-coated AgClBr fibers and development of new sensor intended for the FEWS spectroscopy of organic compounds in water
Author(s): Joseph Reichlin; Edward Bormashenko; Avigdor Sheshnev; Roman Pogreb; Evgeny Shulzinger; Abraham Katzir
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Paper Abstract

This work presents the new approach to the investigation of mass transport process in polymers. The Fiber Optic Evanescent Wave Spectroscopy has been used for the real time investigation of diffusion processes in glassy polymers. Unclad AgClBr fibers of 0.9 mm diameter were dip coated by polystyrene layers of 1 - 30 micrometers thickness. The transmission of the fibers in the mid-IR was measured using a Fourier Transform Infrared spectrometer. The penetration of liquids into these layers gave rise to significant changes in the measured spectrum. These changes were used for diffusion studies in situ. The mathematical model, which allows realizing the quantitative treatment of experimental data, was developed. The model details with processes which take place at two interfaces: polymer/liquid and polymer/optical fiber. It was established that the initial stage of diffusion is of the strictly Fickian character. The model permitted us to calculate the coefficient of diffusion of water in polystyrene with a high accuracy. The huge amount of experimental points, which could be obtained by our method, allows calculation of the equilibrium concentration of penetrating liquid with an extremely high precision. This advantage of FEWS procedure offers a high accuracy of calculations of parameters of diffusion. It must be emphasized that the thickness of the film that could be defined with the least precision doesn't affect on final results. The final stage of diffusion is non-Fickian.

Paper Details

Date Published: 6 July 2000
PDF: 9 pages
Proc. SPIE 4129, Subsurface Sensing Technologies and Applications II, (6 July 2000); doi: 10.1117/12.390627
Show Author Affiliations
Joseph Reichlin, College of Judea and Samaria (Israel)
Edward Bormashenko, College of Judea and Samaria (Israel)
Avigdor Sheshnev, College of Judea and Samaria (Israel)
Roman Pogreb, College of Judea and Samaria (Israel)
Evgeny Shulzinger, Tel Aviv Univ. (Israel)
Abraham Katzir, Tel Aviv Univ. (Israel)

Published in SPIE Proceedings Vol. 4129:
Subsurface Sensing Technologies and Applications II
Cam Nguyen, Editor(s)

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