scholarly journals Effects of geometric particle sizes of wood flour on strength and dimensional properties of wood plastic composites

2013 ◽  
Vol 5 (1) ◽  
pp. 194-199
Author(s):  
D. N. Izekor ◽  
S. O. Amiandamhen ◽  
O. S. Agbarhoaga
Keyword(s):  
Physical Properties ◽  
Wood Flour ◽  
Particle Sizes ◽  
Thickness Swelling ◽  
Wood Plastic Composites ◽  
Dimensional Properties ◽  
Mean Values ◽  
Plastic Composites ◽  
Mechanical And Physical Properties ◽  
Plastic Ratio

The effect of different wood flour sizes on strength and dimensional properties of wood-plastic composites were examined. Wood flour of different particle sizes viz; 1.00mm, 2.00mm and >2.00mm were compounded with recycled low-density polyethylene (LDPE) at different wood/plastic ratio of 1: 1, 2: 3 and 3: 2. The results obtained showed that wood flour size > 2.00mm has the highest MOR and MOE values of 1.206N mm-2 and 2484.72Nmm-2 while wood flour size of 1.00mm had the lowest MOR and MOE values of 0.505Nmm-2 and 2195.89Nmm-2 respectively. Also the results of the physical properties showed that wood flour size of 1.00mm had the lowest thickness swelling percentage with mean values of 0.28% and 2.08% while water absorption percentage has mean values of 0.91% and 10.58% after 2 hours and 24 hours of water immersion respectively. It was observed that wood flour size of 2.00mm and particle size >2.00mm had the highest thickness swelling and water absorption percentages. This showed that strength properties of wood plastic composites increased with increased particle sizes whereas its dimensional properties increased with decreased particle sizes. The results of analysis of variance carried out on mechanical and physical properties showed that particle sizes and wood/plastic ratio had a significant effect on the mechanical and physical properties of wood plastic composites (p 0.05).

scholarly journals Hot water extracted wood fiber for production of wood plastic composites (WPCs)

Holzforschung ◽  
2013 ◽  
Vol 67 (2) ◽  
pp. 193-200 ◽  
Author(s):  
Manuel Raul Pelaez-Samaniego ◽  
Vikram Yadama ◽  
Eini Lowell ◽  
Thomas E. Amidon ◽  
Timothy L. Chaffee
Keyword(s):  
Ponderosa Pine ◽  
Degradation Products ◽  
Wood Flour ◽  
Wood Fiber ◽  
Diffusion Constant ◽  
Hot Water ◽  
Thickness Swelling ◽  
Wood Plastic Composites ◽  
Hot Water Extraction ◽  
Plastic Composites

Abstract Undebarked ponderosa pine chips were treated by hot water extraction to modify the chemical composition. In the treated pine (TP), the mass was reduced by approximately 20%, and the extract was composed mainly of degradation products of hemicelluloses. Wood flour produced from TP and unextracted chips (untreated pine, UP) was blended with high-density polyethylene (HDPE) and polypropylene (PP) and was extruded into wood plastic composites (WPCs). Formulations for WPCs consisted of 58% pine, 32% plastic, and 10% other additives. WPC based on HDPE+TP and PP+TP absorbed 46–45% less water than did WPC based on HDPE+UP and PP+UP, respectively. Thickness swelling was reduced by 45–59%, respectively, after 2520 h of immersion. The diffusion constant decreased by approximately 36%. Evaluation of mechanical properties in flexure and tension mode indicated improvements in TP-WPC properties, although the data were not statistically significant in all cases. Results showed that debarking of ponderosa pine is not required for WPC production.

Effects of Antioxidants Content on the Physical and Mechanical Properties of Wood Plastic Composites

2011 ◽  
Vol 471-472 ◽  
pp. 151-156 ◽  
Author(s):  
Mohd Hafizuddin Ab Ghani ◽  
Ahmad Haji Sahrim
Keyword(s):  
Mechanical Properties ◽  
Physical Properties ◽  
High Density Polyethylene ◽  
Natural Fibers ◽  
Physical And Mechanical Properties ◽  
Screw Extruder ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Mechanical And Physical Properties ◽  
Twin Screw

We investigated the effects of amount of antioxidants variability on selected mechanical and physical properties of wood plastic composites. Recycled high density polyethylene (rHDPE) and natural fibers were compounded into pellets by compounder, then the pellets were extruded using co-rotating twin-screw extruder and test specimens were prepared by hot and cold press process. From the study, samples with 0.5 wt% of antioxidants produce the highest strength and elasticity of composites. The effect of antioxidants presence on water uptake is minimal.

Effects of Premixing Wood Flour with Compatibilizer with Different Characteristics on the Physical and Mechanical Properties of Wood/Plastic Composites

2019 ◽  
Vol 69 (2) ◽  
pp. 141-147
Author(s):  
Kazushige Murayama ◽  
Yoichi Kojima ◽  
Hikaru Kobori ◽  
Kenji Aoki ◽  
Shigehiko Suzuki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Physical Properties ◽  
Shear Viscosity ◽  
Wood Flour ◽  
Physical And Mechanical Properties ◽  
Plastic Composites ◽  
Mechanical And Physical Properties ◽  
One Step ◽  
Mixing Method

Abstract The addition of maleic anhydride (MA)-modified polypropylene (MAPP) as a compatibilizer increases mechanical and physical properties of wood/plastic composites (WPCs). It is thought that MA graft ratio (Gr), molecular weight (weight-average molecular weight [Mw]), and mixing methods of MAPP affect physical and mechanical properties of WPCs. However, evaluation, especially for mixing order, is not enough. The objective of this study was to investigate the effect of Gr and Mw of MAPP and its mixing methods on the mechanical and physical properties of WPCs. Two types of mixing methods were used: mixing the MAPP with the filler using a Henschel mixer before kneading with PP (premixing method) and mixing all of the materials at one time (one-step mixing method). The WPCs made with the premixing method had lower shear viscosity and higher flexural modulus than those made with the one-step mixing method. The particle size, moisture content, and surface morphology of fillers are thought to be more important in determining the shear viscosity of WPCs than the MAPP itself. The highest tensile, impact, and flexural strengths of WPCs were obtained in the WPC with premixing with low-Gr and high-Mw MAPP. It may be due to the effective reaction of the wood flour with MAPP and higher entanglement between the MAPP and PP. These results suggest that the premixing method could improve productivity and mechanical properties of WPCs.

In situ fabrication of wood flour/nano silica hybrid and its application in polypropylene‐based wood‐plastic composites

2019 ◽  
Vol 41 (2) ◽  
pp. 573-584 ◽  
Author(s):  
Yuanbin Ma ◽  
Hui He ◽  
Bai Huang ◽  
Huaishuai Jing ◽  
Zijin Zhao
Keyword(s):  
Wood Flour ◽  
Nano Silica ◽  
Wood Plastic Composites ◽  
In Situ Fabrication ◽  
Plastic Composites ◽  
Silica Hybrid

scholarly journals Properties of Fibrillated Wood Flour, and of Wood-plastic Composites Made with Fibrillated Wood Flour

2017 ◽  
Vol 63 (3) ◽  
pp. 131-136 ◽  
Author(s):  
Hirokazu Ito ◽  
Shinji Ogoe ◽  
Masaki Okamoto ◽  
Shigehiko Suzuki ◽  
Yoichi Kojima ◽  
...  
Keyword(s):  
Wood Flour ◽  
Wood Plastic Composites ◽  
Plastic Composites
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