Pasupuleti, Sasikiran and Madras, Giridhar (2010) Ultrasonic degradation of poly (styrene-co-alkyl methacrylate) copolymers. In: Ultrasonics Sonochemistry, 17 (5). pp. 819-826.
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The ultrasonic degradation of poly (styrene-co-methyl methacrylate) (SMMA), poly (styrene-co-ethyl methacrylate) (SEMA) and poly (styrene-co-butyl methacrylate) (SBMA) copolymers of different compositions was studied. The copolymers were synthesized and NMR spectroscopy was used to determine the composition, and the glass transition temperatures were determined by DSC. The reactivity ratios were determined by the Kelen-Tudos method and it indicated that the copolymers were random. The effect of solvent, temperature and copolymer composition on the ultrasonic degradation rate of these copolymers was investigated. A model based on continuous distribution kinetics was employed to study the degradation kinetics. The degradation rate coefficients of the copolymers decreased with an increase in the styrene content in the copolymer. At any particular copolymer composition the rate of degradation follows the order: SBMA >SEMA > SMMA. Thermogravimetric analysis (TGA) of the copolymers was carried in order to assess their thermal stability. The same order of degradation was observed for the thermal degradation of the copolymers as that observed for ultrasonic degradation. (C) 2010 Elsevier B.V. All rights reserved.
|Item Type:||Journal Article|
|Additional Information:||Copyright of this article belongs to Elsevier Science.|
|Keywords:||Ultrasonic degradation;Styrene-co-alkyl methacrylates; Copolymers;Rate coefficients;Thermal stability|
|Department/Centre:||Division of Mechanical Sciences > Chemical Engineering|
|Date Deposited:||23 Jun 2010 05:25|
|Last Modified:||19 Sep 2010 06:09|
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