Physical Properties of Novel Layered Composites of Wood Flour and PVC

Tajvidi, Mehdi; Haghdan, Shayesteh; Najafi, Saeed Kazemi

doi:10.1177/07316844080270160101

Cited by 13 publications

(11 citation statements)

References 8 publications

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“…Water diffusion coefficients of the composite formulations were then calculated using the following formula 20. This formula has been widely used for natural fiber plastic composites2, 5, 7–9, 21 and has been found to predict water absorption rate accurately. where D is the water diffusion coefficient corrected for edge effect; m , the slope of linear portion of the water content against root time/thickness curve; M ∞ , the equilibrium moisture content, which is the value of the water absorbed such that there is no further change in the water absorption with time; h , the thickness; L , the length; and n is the width.…”

Section: Resultsmentioning

confidence: 99%

“…However, the mechanism of thickness swelling is not fully known. Evaluation of the relationship between water absorption and thickness swelling can help to understand the mechanism of thickness swelling as well 7. As seen in Figure 4, for all wood flour composite formulations, thickness swelling increased nonlinearly as water absorption increased.…”

Section: Resultsmentioning

confidence: 99%

“…Because water absorption can influence many properties such as dimensional stability, natural durability, and physical and mechanical properties, better durability and performance of these materials can be achieved if water absorption is restricted. Research has revealed that water absorption in natural fiber plastic composites depends on a good number of formulation and processing characteristics including but not limited to natural fiber or plastic type, processing system, fiber size, and distribution and interfacial quality 2–8…”

Section: Introductionmentioning

confidence: 99%

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Effects of reprocessing on the hygroscopic behavior of natural fiber high‐density polyethylene composites

Tajvidi

Takemura

2011

J of Applied Polymer Sci

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Detailed analysis of the effects of recycling process on long-term water absorption, thickness swelling, and water desorption behavior of natural fiber highdensity polyethylene composites is reported. Composite materials containing polyethylene and wood flour, rice hulls, or bagasse fibers and 2% compatibilizer were produced at constant fiber loading and were exposed to a simulated recycling process consisting of up to five times grinding and reprocessing under controlled conditions. A wide range of analytical methods including water absorption/desorption tests, thickness swelling tests, density measurement, scanning electron microscopy, image analysis, contact angle, fiber length analysis, Fourier transform infrared spectroscopy, and tensile tests were employed to understand the hygroscopic behavior of the recycled composites. Water absorption and thickness swelling behaviors were modeled using existing predictive models and a mathematical model was developed for water desorption at constant temperature. Results indicated that generally the recycled composites had considerably lower water absorption and thickness swellings as compared with the original composites which were attributed to changes in physical and chemical properties of the composites induced by the recycling process. Water desorption was found to be faster after recycling.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of reprocessing on the hygroscopic behavior of natural fiber high‐density polyethylene composites

Tajvidi

Takemura

2011

J of Applied Polymer Sci

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“…3 (Shen and Springer, 1976). This formula has been widely used for natural fiber (wood flour) plastic composites (Najafi et al, 2007a;Najafi et al, 2007b;Najafi et al, 2008;Tajvidi et al, 2006;Tajvidi et al, 2008) and has been found to work well.…”

Section: Characterization Physical Testingmentioning

confidence: 99%

Isıl işlem odun dolgulu stiren maleik anhidrit kopolimer kompozitleri

Zor

Kızıltaş²,

Wang³

et al. 2018

Kastamonu Üniversitesi Orman Fakültesi Dergisi

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Aim of study: In this study, it was aimed to establish and optimize a production process for engineering thermoplastic composites based on heat treated wood fillers and SMA copolymer. Material and Methods: As wood material, pine wood (Pinus strobus L.), and as a thermoplastic copolymer material, Styrene Maleic Anhydride (SMA) copolymer were used in this study. Heat treatment was conducted at 212°C for 8 h in an attempt to improve the durability of the wood furnish and the wood flour and SMA compounds were extruded and granulated using a lab-scale grinder. Physical test, mechanical test and morphological tests were calculated. Main results: The results showed that the highest tensile strength was in the 30 wt.% wood flour/SMA and it has been seen that the positive effect on FMOE,TMOE of heat treated wood flour/SMA. Weak interfacial bonding was observed between the polymer and wood filler from the SEM images of the fractured surfaces of wood flour/SMA composites. Research highlights: The results from this research indicated the compatibility of the SMA copolymer with the wood flour and the changes in the mechanical strength of the material. Due to limited heat treated wood thermoplastic composite usage in the field of wood engineering, there is a need for more extensive work in the future.

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“…[4][5][6][7][8][9][10][11] In all these studies, the main goal was limited to improving the tensile and bending properties of the composite and enhancing its resistance against water absorption. In further studies, 12-17 a combination of wood flour with glass fiber in a polymer matrix improved tensile modulus, bending strength, and panels' dimensional stability.…”

Section: Introductionmentioning

confidence: 99%

Effects of reinforcement configuration and densification on impact strength of wood veneer/polyester composites

Haghdan

Tannert

Smith

2014

Journal of Composite Materials

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Current energy absorbers in industrial applications are made of metals or fiber-reinforced polymers using glass and carbon fibers. These materials are extremely stiff and strong but exhibit low-energy absorption when subject to the impact load. Other issues in the use of these materials are their high cost (fiber-reinforced polymer) and weight (metal). Wood reinforcements on the other hand are light weight and economic but less stiff. This study investigated the impact resistance and fracture patterns of wood-reinforced polyester composites using a drop-weigh impact test and considers the potential of using wood as a natural reinforcement in the manufacturing of polymer composites. Densified and undensified Douglas-fir veneers were used to create three different mat configurations: woven, cross, and unwoven (unidirectional) mats. A total of 350 specimens were tested following ASTM D5420, and their impact resistance was calculated using the staircase method. Scanning electron microscopy was used to examine the resin distribution and its penetration into the reinforcement. Additionally, light micrographs of the veneers before and after densification were examined to determine the effect of densification on the cell-wall structure. Glass fiber-reinforced polymer samples had significantly higher impact resistance than the wood composites. Densification of the veneer did not significantly improve the composite performance. The effect of reinforcement configuration on the final performance of the wood-polyester composites, however, was significant with the woven, and cross configurations having notably higher impact energy than unidirectional composites.

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Physical Properties of Novel Layered Composites of Wood Flour and PVC

Cited by 13 publications

References 8 publications

Effects of reprocessing on the hygroscopic behavior of natural fiber high‐density polyethylene composites

Effects of reprocessing on the hygroscopic behavior of natural fiber high‐density polyethylene composites

Isıl işlem odun dolgulu stiren maleik anhidrit kopolimer kompozitleri

Effects of reinforcement configuration and densification on impact strength of wood veneer/polyester composites

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