Vijayalakshmi, SP and Madras, Giridhar (2006) Photodegradation of Poly(vinyl alcohol) Under UV and Pulsed-Laser Irradiation in Aqueous Solution. In: Journal of Applied Polymer Science, 102 (2). pp. 958-966.
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Abstract
The photodegradation of poly(vinyl alcohol) (PVA) in aqueous solution was investigated under UV exposure and pulsed-laser irradiation. The degradation under UV exposure was studied at different pH values and with the addition of potassium chloride and potassium dichromate. The pulsed- laser degradation of PVA was investigated with a Nd : YAG laser, operating at a wavelength of 266 nm with about 6-ns pulses. The pulsed-laser degradation was studied at different polymer concentrations and light intensities. Samples were analyzed by gel permeation chromatography. The degradation rate coefficients were determined by the application of a continuous distribution model. The photodegradation rates under UV exposure were highest at extremes of pH and were greatly enhanced by the addition of potassium chloride and potassium dichromate. The pulsed-laser degradation of the polymer decreased with increasing polymer concentration, although a threshold light intensity was required to initiate the degradation process.
Item Type: | Journal Article |
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Publication: | Journal of Applied Polymer Science |
Publisher: | Wiley Periodicals, Inc. |
Additional Information: | Copyright of this article belongs to Wiley Periodicals, Inc. |
Keywords: | Degradation;Photochemistry;Recycling;Watersoluble polymers |
Department/Centre: | Division of Mechanical Sciences > Chemical Engineering |
Date Deposited: | 27 Nov 2007 |
Last Modified: | 19 Sep 2010 04:32 |
URI: | http://eprints.iisc.ac.in/id/eprint/8773 |
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