COMPARISON OF RESISTANCE AND BIODEGRADABILITY PROPERTIES OF WOOD-PLASTIC COMPOSITES FROM WOOD FLOUR/ PHB / HDPE / STARCH
In this study, mechanical and biodegradability properties of wood plastic composite were investigated. Beech (fagus orientalis) flour 40 wt% was used as a reinforcing base material, maleic anhydride as a coupling agents and nano clay to improve the properties were added. The polymer studied was polyhydroxybutyrate (PHB) and the other polymer was high-density polyethylene (HDPE) .Three groups of composites were produced, in two groups each of the polymers alone and in the third group a combination of two types of polymers was used as a matrix. Starch 8 wt% and 12wt% was used as a copolymer. The specimens were mixed using a twin-screw extruder and made with an injection molding machine and subjected to mechanical tests: tensile strength and module, bending strength and module, impact resistance tests and biodegradability tests. In mechanical properties, it was observed that wood plastic composite with PHB base material has lower resistance properties than composites containing HDPE. With the addition of starch, all resistance properties were significantly reduced compared to the control sample without starch in all three groups of composite samples. Starch could not play the role of copolymer well in any of the groups. The third group of samples presented better results in terms of resistance properties than the first group. Modulus and resistances increased compared to the first group. In the biodegradability test, the samples were buried at a height of 25 cm for three months. Weight loss was due to the destruction of wood flour, starch and natural polymers by soil microorganisms. The weight loss trend of the samples was increasing until the end of the second month and then decreasing.
The copyright of an article published in Wood and Fiber Science is transferred to the Society of Wood Science and Technology (for U. S. Government employees: to the extent transferable), effective if and when the article is accepted for publication. This transfer grants the Society of Wood Science and Technology permission to republish all or any part of the article in any form, e.g., reprints for sale, microfiche, proceedings, etc. However, the authors reserve the following as set forth in the Copyright Law:
1. All proprietary rights other than copyright, such as patent rights.
2. The right to grant or refuse permission to third parties to republish all or part of the article or translations thereof. In the case of whole articles, such third parties must obtain Society of Wood Science and Technology written permission as well. However, the Society may grant rights with respect to Journal issues as a whole.
3. The right to use all or part of this article in future works of their own, such as lectures, press releases, reviews, text books, or reprint books.