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Influence of Temperature on Mechanical Properties of Jute/Biopolymer Composites

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Authors:
  • Løvdal, Alexandra Liv Vest ;
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    Department of Micro- and Nanotechnology, Technical University of Denmark
  • Laursen, Louise Løcke ;
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    Department of Systems Biology, Technical University of Denmark
  • Løgstrup Andersen, Tom ;
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    Department of Wind Energy, Technical University of Denmark
  • Madsen, Bo ;
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    Department of Wind Energy, Technical University of Denmark
  • Mikkelsen, Lars Pilgaard
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    Orcid logo0000-0002-6323-4395
    Department of Wind Energy, Technical University of Denmark
DOI:
10.1002/app.38387
Abstract:
Biopolymers and natural fibers are receiving wide attention for the potential to have good performance composites with low environmental impact. A current limitation of most biopolymers is however their change in mechanical properties at elevated temperatures. This study investigates the mechanical properties of two biomass-based polymers, polylactic acid (PLA) and cellulose acetate (CA), as a function of ambient temperature in the range from 5 to 80C. Tests were done for neat polymers and for jute fiber/biopolymer composites. Micromechanical models were applied to back-calculate the reinforcement efficiency of the jute fibers. The elastic modulus of neat PLA is constant until a temperature of about 45C, after which it is decreased rapidly. For neat CA, the elastic modulus is almost constant in the whole temperature range. The maximum stress of the neat biopolymers is consistently reduced. For the jute fiber composites, both the elastic modulus and maximum stress are reduced when the temperature is increased. For the elastic modulus, this is shown to be due to a reduction in the reinforcement efficiency of the jute fibers; i.e., a reduction in the back-calculated effective elastic modulus of the fibers. Altogether, the results demonstrate that the thermal sensitivity parameters typically provided for polymers, e.g., the glass transition temperature and the heat deflection temperature, cannot be used as sole parameters for determining the gradual change in mechanical properties of polymers and composites. © 2012 Wiley Periodicals, Inc.
Type:
Journal article
Language:
English
Published in:
Journal of Applied Polymer Science, 2013, Vol 128, Issue 3, p. 2038-2045
Keywords:
Biopolymers and renewable polymers; Composites; Mechanical properties; Thermal properties
Main Research Area:
Science/technology
Publication Status:
Published
Review type:
Peer Review
Submission year:
2012
Scientific Level:
Scientific
ID:
235925983

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