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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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|
|Additional Information:||Copyright of this article belongs to Wiley Periodicals, Inc.|
|Department/Centre:||Division of Mechanical Sciences > Chemical Engineering|
|Date Deposited:||27 Nov 2007|
|Last Modified:||19 Sep 2010 04:32|
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