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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/24691
Title: Enzymatic degradation of poly (ε-caprolactone), poly (vinyl acetate) and their blends by lipases
Authors: Sivalingam G.
Chattopadhyay, Sujay
Madras G.
Published in: Chemical Engineering Science
Abstract: Poly (ε-caprolactone) (PCL) and poly (vinyl acetate) (PVAc) and their blends were degraded in toluene by two lipases (Novozym 435 and Candida Rugosa) at 60°C. The degradation of PCL and side-chain hydrolysis of PVAc yielded specific products of molecular weight ∼500 and ∼700, respectively. FTIR analysis of the polymer before and after enzyme treatment and the specific products show that there is large reduction of ester linkages and generation of -OH, -COO(-), -COOH groups in the broken chains. The optimal temperature for the side-chain hydrolysis of PVAc was 60 and 65°C and the optimal temperature for the biodegradation of PCL was 55 and 60°C for Candida Rugosa and Novozym 435, respectively. Continuous distribution kinetics was proposed for determining the rate coefficients of the polymers and deactivation of the enzyme. Enzymatic degradation studies of PCL-PVAc blends showed that there is a drastic reduction in the degradation of PCL in the blends. This was modeled by the interaction between polymers. © 2003 Elsevier Science Ltd. All rights reserved.
Citation: Chemical Engineering Science, 58(13): 2911-2919
URI: https://doi.org/10.1016/S0009-2509(03)00155-6
http://repository.iitr.ac.in/handle/123456789/24691
Issue Date: 2003
Publisher: Elsevier Ltd
Keywords: Continuous distribution kinetics
Enzyme
Kinetics
Polymer blends
Polymers
Population balances
ISSN: 92509
Author Scopus IDs: 6701661874
7403001849
7005905149
Author Affiliations: Sivalingam, G., Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
Chattopadhyay, S., Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
Madras, G., Department of Chemical Engineering, Indian Institute of Science, Bangalore 560012, India
Funding Details: The authors thank the department of Science and Technology for financial support. Department of Science and Technology
Corresponding Author: Madras, G.; Department of Chemical Engineering, , Bangalore 560012, India; email: giridhar@chemeng.iisc.ernet.in
Appears in Collections:Journal Publications [PE]

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