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Pulsed laser degradation of polyethylene oxide and polyacrylamide in aqueous solution.

Vijayalakshmi, SP and Senapati, Dulal and Madras, Giridhar (2005) Pulsed laser degradation of polyethylene oxide and polyacrylamide in aqueous solution. In: Polymer Degradation and Stability, 87 (3). pp. 521-526.

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Abstract

The kinetics of degradation of polyethylene oxide (PEO) and polyacrylamide (PAM) was investigated using a pulsed Nd:YAG laser, operating at 266 nm wavelength with $\sim 6$ ns pulses. Gel permeation chromatograph was used to monitor the change in molecular weight with time. Continuous distribution kinetics for random chain scission was used to obtain the rate coefficient for the degradation process. The measured rate coefficients for the degradation are $1.9\times 10^4$ and $1.2\times 10^4 \hspace {5mm} s^{-1}$ for PEO and PAM, respectively. A pathway for degradation has been proposed based on the experimental observations. The signi.cance of polymer concentration and the laser light intensity along with the requirement of oxygen for degradation has been correlated to the mechanism of the degradation process. The degradation was found to decrease with increasing polymer concentration while a threshold light intensity was required to initiate the degradation process.

Item Type: Journal Article
Additional Information: The Copyright belongs to Elsevier.
Keywords: Polymer degradation;Pulsed laser;Kinetics;Polyethylene oxide;Polyacrylamide
Department/Centre: Division of Mechanical Sciences > Chemical Engineering
Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 16 Mar 2006
Last Modified: 19 Sep 2010 04:24
URI: http://eprints.iisc.ernet.in/id/eprint/5826

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