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Thermal and Mechanical Properties of the Biocomposites of Miscanthus Biocarbon and Poly(3- H ydroxybutyrate- co -3- H ydroxyvalerate) (PHBV)

Authors
  • Li, Zonglin1
  • Reimer, Christoff1
  • Wang, Tao1
  • Mohanty, Amar K.1, 2
  • Misra, Manjusri1, 2
  • 1 (T.W.)
  • 2 School of Engineering, Thornbrough Building, University of Guelph, Guelph, ON N1G 2W1, Canada
Type
Published Article
Journal
Polymers
Publisher
MDPI AG
Publication Date
Jun 06, 2020
Volume
12
Issue
6
Identifiers
DOI: 10.3390/polym12061300
PMID: 32517200
PMCID: PMC7362254
Source
PubMed Central
Keywords
Disciplines
  • Article
License
Green

Abstract

Miscanthus biocarbon (MB), a renewable resource-based, carbon-rich material, was melt-processed with poly (3-hydroxybutyrate- co -3-hydroxyvalerate) (PHBV) to produce sustainable biocomposites. The addition of the biocarbon improved the Young’s modulus of PHBV from 3.6 to 5.2 GPa at 30 wt % filler loading. An increase in flexural modulus, up to 48%, was also observed. On the other hand, the strength, elongation-at-break and impact strength decreased. Morphological study of the impact-fractured surfaces showed weak interaction at the interface and the existence of voids and agglomerates, especially with high filler contents. The thermal stability of the PHBV/MB composites was slightly reduced compared with the neat PHBV. The biocarbon particles were not found to have a nucleating effect on the polymer. The degradation of PHBV and the formation of unstable imperfect crystals were revealed by differential scanning calorimetry (DSC) analysis. Higher filler contents resulted in reduced crystallinity, indicating more pronounced effect on polymer chain mobility restriction. With the addition of 30 wt % biocarbon, the heat deflection temperature (HDT) became 13 degrees higher and the coefficient of linear thermal expansion (CLTE) decreased from 100.6 to 75.6 μm/(m·°C), desired improvement for practical applications.

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