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Anhydride production as an additional mechanism of poly(3-hydroxybutyrate)pyrolysis.


Ariffin, Hidayah and Nishida, Haruo and Shirai, Yoshihito and Hassan, Mohd Ali (2009) Anhydride production as an additional mechanism of poly(3-hydroxybutyrate)pyrolysis. Journal of Applied Polymer Science, 111 (1). pp. 323-328. ISSN 0021-8995


Anhydrides production is newly proposed as an additional pyrolysis mechanism of a biopolymer, poly(3hydroxybutyrate) (PHB). In spite of many suggestions of multiple degradation mechanisms, simple random chain scission by b elimination has been accepted as an exclusive mechanism of the thermal degradation of PHB. However, a wide range of activation energy value of the degradation and the deviation from the random chain scission statistics have suggested the presence of other kinds of mechanism out of the random scission. To confirm other mechanisms out of the random scission, minor pyrolyzates from PHB were characterized with 1H/13C-NMR, Fourier transform infrared spectroscopy, and fast atom bombardment mass spectrometry. As a result, crotonic anhydride and its oligomers were detected as minor products from condensation reactions between carboxyl groups. The anhydrides production must be one reaction out of the conforming process to the random degradation statistics and contribute to the complexity of PHB pyrolysis. An expected thermal degradation pathway of PHB was proposed.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Biotechnology and Biomolecular Sciences
DOI Number: https://doi.org/10.1002/app.29034
Publisher: Wiley Periodicals Inc.
Keywords: Biopolymers; Pyrolysis; Mechanism; Thermogravimetric analysis (TGA); Recycling.
Depositing User: Ms. Nida Hidayati Ghazali
Date Deposited: 23 Jul 2013 03:58
Last Modified: 18 Nov 2015 03:52
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/app.29034
URI: http://psasir.upm.edu.my/id/eprint/13111
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