Ishak, Khairul Anwar and Velayutham, Thamil Selvi and Annuar, Mohamad Suffian Mohamad and Sirajudeen, A. Azeez Olayiwola (2021) Structure-property interpretation of biological polyhydroxyalkanoates with different monomeric composition: Dielectric spectroscopy investigation. International Journal of Biological Macromolecules, 169. pp. 311-320. ISSN 0141-8130, DOI https://doi.org/10.1016/j.ijbiomac.2020.12.090.
Full text not available from this repository.Abstract
Dielectric spectroscopy is employed to study the relaxation phenomena in natural polyhydroxyalkanoates (PHAs) upon temperature and frequency variations. Effects of PHAsmolecular structure on the relaxation, arising from the differences in monomeric composition, are investigated under identical conditions in a frequency range of 10-2-106 Hz, and at different temperatures. All PHA samples showed different dielectric response at different temperature. Primary a-relaxation signals are observed at temperature corresponding to the glass transition temperature. On the other hand, secondary beta- and gamma-relaxations are detected at low temperatures, and attributed to localmotions of polar groups and small segments of the polymer chain. The dielectric properties of representative PHA samples are compared and discussed. (C) 2020 Elsevier B.V. All rights reserved.
| Item Type: | Article |
|---|---|
| Funders: | University of Malaya through High Impact Research Grant UM.C/625/1/HIR/MOHE/05, University of Malaya through Impact-Oriented Interdisciplinary Research Grant IIRG017A-2019, Ministry of Higher Education, Malaysia through Fundamental Research Grant Scheme (FRGS) FP079-2018A |
| Uncontrolled Keywords: | Polyhydroxyalkanoates (PHAs); Biological polymers; Dielectric spectroscopy; Dielectric loss; Molecular relaxation |
| Subjects: | Q Science > QD Chemistry Q Science > QH Natural history > QH301 Biology |
| Divisions: | Faculty of Science > Institute of Biological Sciences Faculty of Science > Department of Chemistry Faculty of Science > Department of Physics |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 13 Apr 2022 02:55 |
| Last Modified: | 13 Apr 2022 02:55 |
| URI: | http://eprints.um.edu.my/id/eprint/26690 |
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