Influence of temperature on mechanical properties of jute/biopolymer composites

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...

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Bibliographic Details
Published in:Journal of applied polymer science 2013-05, Vol.128 (3), p.2038-2045
Main Authors: Løvdal, Alexandra, Laursen, Louise Løcke, Andersen, Tom Løgstrup, Madsen, Bo, Mikkelsen, Lars Pilgaard
Format: Article
Language:English
Subjects:
Applied sciences
Biopolymers
biopolymers and renewable polymers
composites
Elastic modulus
Exact sciences and technology
Fibers
Forms of application and semi-finished materials
Jute
Laminates
Materials science
Mathematical models
Mechanical properties
Modulus of elasticity
Polymer industry, paints, wood
Polymers
Reduction
Technology of polymers
thermal properties
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Summary: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 80°C. 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 45°C, 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. J. Appl. Polym. Sci., 2013
ISSN:0021-8995
1097-4628
DOI:10.1002/app.38387