Structure-property interpretation of biological polyhydroxyalkanoates with different monomeric composition: Dielectric spectroscopy investigation
Document Type
Article
Publication Date
2-1-2021
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.
Keywords
Polyhydroxyalkanoates (PHAs), Biological polymers, Dielectric spectroscopy, Dielectric loss, Molecular relaxation
Divisions
InstituteofBiologicalSciences,CHEMISTRY,PHYSICS
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
Publication Title
International Journal of Biological Macromolecules
Volume
169
Publisher
Elsevier
Publisher Location
RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS