Influence of graphene nanoplatelet incorporation and dispersion state on thermal, mechanical and electrical properties of biodegradable matrices

Kashi, S, Gupta, R, Kao, N, Hadigheh, S and Bhattacharya, S 2018, 'Influence of graphene nanoplatelet incorporation and dispersion state on thermal, mechanical and electrical properties of biodegradable matrices', Journal of Materials Science and Technology, vol. 34, no. 6, pp. 1026-1034.


Document type: Journal Article
Collection: Journal Articles

Title Influence of graphene nanoplatelet incorporation and dispersion state on thermal, mechanical and electrical properties of biodegradable matrices
Author(s) Kashi, S
Gupta, R
Kao, N
Hadigheh, S
Bhattacharya, S
Year 2018
Journal name Journal of Materials Science and Technology
Volume number 34
Issue number 6
Start page 1026
End page 1034
Total pages 9
Publisher Zhongguo Kexueyuan Jinshu Yanjiusuo
Abstract Graphene nanoplatelets (GNPs) were used as multifunctional nanofiller to enhance thermal and mechanical properties as well as electrical conductivity of two different biodegradable thermoplastics: poly lactide (PLA) and poly (butylene adipate-co-terephthalate) (PBAT). Morphological investigations showed different levels of GNP dispersion in the two matrices, and consequently physical properties of the two systems exhibited dissimilar behaviours with GNP incorporation. Crystallinity of PLA, determined from differential scanning calorimetry, was observed to increase markedly with addition of GNPs in contrast to the decrease in crystallinity of PBAT. Isothermal and non-isothermal thermogravimetric analyses also revealed a more significant delay in thermal decomposition of PLA upon addition of GNPs compared to that of PBAT. Furthermore, results showed that increasing GNP content of PLA and PBAT nanocomposites influenced their Young's modulus and electrical conductivity in different ways. Modulus of PBAT increased continuously with increasing GNP loading while that of PLA reached a maximum at 9 wt% GNPs and then decreased. Moreover, despite the higher conductivity of pure PBAT compared to pure PLA, conductivity of PLA/GNP nanocomposites overtook that of PBAT/GNP nanocomposites above a certain GNP concentration. This demonstrated the determining effect of nanoplatelets dispersion state on the matrices properties.
Subject Mechanical Engineering not elsewhere classified
Manufacturing Engineering not elsewhere classified
Materials Engineering not elsewhere classified
Keyword(s) Electrical conductivity
Graphene
Nanocomposite
Poly butylene adipate-co-terephthalate
Poly lactide
Properties
Thermal stability
DOI - identifier 10.1016/j.jmst.2017.10.013
Copyright notice © 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology
ISSN 1005-0302
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