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

Publication Title

International Journal of Biological Macromolecules

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

Volume

169

Publisher

Elsevier

Publisher Location

RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS

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