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Kinetics of the enzymatic degradation of poly(vinyl acetate) in solution

✍ Scribed by Sujay Chattopadhyay; Giridhar Madras

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
70 KB
Volume
89
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

The enzymatic degradability of poly(vinyl acetate) was investigated in toluene solutions at various temperatures with hog pancreas lipase. The polymer degraded by specific scission to yield oligomeric products with a molecular weight of 700. Continuous distribution kinetics were used to determine the rate coefficients. The variation of the rate coefficients with the temperature indicated an optimum at 55Β°C. The p‐toluene sulfonic acid catalyzed degradation of poly(vinyl acetate) was also investigated. The degradation mechanism was random chain scission, and the energy of activation for degradation was determined from the variation of the rate coefficients with the temperature. Β© 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2579–2582, 2003

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The ultrasonic degradation of poly(vinyl acetate) (PVAc) solutions was carried out in tetrahydrofuran (THF) at 20, 25, 30, and 35Β°C to investigate the effects of the temperature and solution concentration on the rate of degradation. The degradation kinetics were studied with viscometry. The calculat