Effect of Matrix–Particle Interfacial Adhesion on the Mechanical Properties of Poly(lactic acid)/Wood-Flour Micro-Composites |
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Authors: | Eustathios Petinakis Long Yu Graham Edward Katherine Dean Hongsheng Liu Andrew D Scully |
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Institution: | (1) CSIRO Materials Science and Engineering, Clayton, VIC, Australia;(2) School of Materials Engineering, Monash University, Clayton, VIC, Australia;(3) Centre for Polymers from Renewable Resources, South China University of Technology, Guangzhou, People’s Republic of China;(4) CSIRO Molecular and Health Technologies, Clayton, VIC, Australia; |
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Abstract: | The influence of interfacial matrix/particle adhesion on the mechanical properties of poly(lactic acid) (PLA) micro-composites
was investigated. The tensile strength of PLA/wood-flour micro-composites is almost independent of wood-flour content, suggesting
only weak adhesion exists between the PLA matrix and the wood-flour particles. The addition of wood-flour resulted in an increase
of up to 95% in the tensile modulus, in comparison with pure PLA, which showed a more resilient matrix. The addition of a
coupling agent, methylenediphenyl-diisocyanate (MDI) to the composition resulted in an increase in tensile strength and tensile
modulus of the micro-composites, of 10 and 135%, respectively, indicating enhanced matrix–particle interfacial adhesion. SEM
and electron probe microanalysis provided evidence of improved interfacial adhesion between PLA and wood-flour particles from
the addition of MDI. In contrast, addition of PEAA resulted in a micro-composite displaying substantially reduced tensile
strength, up to 35% and a slightly increased in impact strength, up to 15%, consistent with the introduction of the rubbery
PEAA component into the polymeric matrix. No evidence for increased matrix–particle adhesion was found for the PLA/wood-flour
micro-composites containing PEAA. |
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