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Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation.


Citation

Ariffin, Hidayah and Nishida, Haruo and Shirai, Yoshihito and Hassan, Mohd Ali (2010) Highly selective transformation of poly[(R)-3-hydroxybutyric acid] into trans-crotonic acid by catalytic thermal degradation. Polymer Degradation and Stability, 95 (8). pp. 1375-1381. ISSN 0141-3910; ESSN: ESSN: 1873-2321

Abstract

Highly selective transformation of poly[(R)-3-hydroxybutyric acid] (PHB) into trans-crotonic acid was achieved by thermal degradation using Mg compounds: MgO and Mg(OH)2 as catalysts. Through catalytic action, not only the temperature and Ea value of degradation were lowered by 40–50 °C and 11–14 kJ mol−1, respectively, but also significant changes in the selectivity of pyrolyzates were observed. Notably, Mg(OH)2 showed nearly complete selectivity (∼100%) to trans-crotonic acid. Kinetic analysis of TG profiles revealed that the catalytic thermal degradation of PHB was initiated by some random degradation reactions, followed by the unzipping β-elimination from crotonate chain-ends as a main process. It was suggested that the Mg catalysts promote the totality of the β-elimination reactions by acting throughout the beginning and main processes, resulting in a lowering in the degradation temperature and the completely selective transformation of PHB.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
DOI Number: https://doi.org/10.1016/j.polymdegradstab.2010.01.018
Publisher: Elsevier
Keywords: Polyhydroxy butyrate; Catalytic depolymerization; Crotonic acid; Unzipping b-elimination; Kinetic analysis.
Depositing User: Ms. Nida Hidayati Ghazali
Date Deposited: 09 Jan 2014 07:43
Last Modified: 29 Oct 2015 08:03
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.polymdegradstab.2010.01.018
URI: http://psasir.upm.edu.my/id/eprint/15012
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