Mechanical and thermal behaviors of acrylate-modified wood flour/polypropylene composite

Document Type : Research Paper

Authors

1 Department of Wood and Cellulosic Products Engineering, Faculty of Natural Resources, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Department of Chemistry, University of Kurdistan, Sanandaj, Iran.

10.22059/jfwp.2024.380801.1307

Abstract

The compatibility between the polymer matrix and natural fillers is improved by using a coupling agent or modifying the fillers. This study investigates the effect of acrylate modification of natural fillers with glycidyl methacrylate (GMA) and glycidyl methacrylate/methyl methacrylate (GMA/MMA) on the properties of poplar wood flour/polypropylene composites at different weight ratios, with and without maleic anhydride grafted to polypropylene, produced by the injection molding method. Bending and tensile strengths were significantly improved by increasing the proportion of wood flour up to 30%, but these properties decreased at a filler ratio of 40%. In samples with higher filler ratios, the effect of the coupling agent and filler modification on improving properties was more significant. Notch impact resistance decreased with increasing filler ratio, and the coupling agent and filler modification with GMA reduced this resistance compared to the control samples. The decrease was more pronounced for the composite containing the combined modified fillers, as more force was required for crack development. Greater integrity and fewer holes in the structure of products containing wood flour modified with GMA and GMA/MMA significantly improved the thermal stability of the resulting composite compared to the product containing only the coupling agent, which was more evident for the sample containing the combined modified filler, especially at higher filler ratios.

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Main Subjects

References

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Forest and Wood Products
Volume 77, Issue 3
December 2024
Pages 275-286

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