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Title: Durability and mechanical properties of silane cross-linked wood thermoplastic composites

Source: Composites science and technology. Vol. 67 (2007): pages 2728-2738.

Author(s)Bengtsson, Magnus; Stark, Nicole M.; Oksman, Kristiina

Publication Year: 2007  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4706-2A

Abstract: In this study, silane cross-linked wood-polyethylene composite profiles were manufactured by reactive extrusion. These composites were evaluated regarding their durability and mechanical properties in comparison with two non-cross-linked wood- polyethylene composites. An addition of only 2% w/w of silane solution during manufacturing was enough to achieve almost 60% degree of cross-linking after curing. The cross-linked composites showed flexural toughness superior to the non-cross-linked composites. The cross-linked composites also absorbed less moisture during a boiling test in water and this was an indirect evidence of improved interfacial adhesion. After accelerated weathering for 1000-3000h the general trend was a decrease in flexural modulus and strength of both the non-cross-linked and cross-linked composites. The decrease in modulus seemed to be lower for the cross-linked composites while the decrease in strength seemed to be higher compared to the non-cross-linked composites. Weathering also resulted in a considerable colour fading of the composites. Water absorption-freeze-thaw cycling decreased the flexural modulus of non-cross-linked composites considerably while there was no statistical decrease in modulus for the cross- linked composites. There was only an insignificant decrease in strength for the composites after the water absorption-freeze-thaw cycling.

Keywords: Polymer matrix composites, mechanical properties, durability, extrusion, cross-linking, weathering, extrusion process, adhesion, wood plastic composites, composite materials, thermoplastic composites, silane, crosslinking, polymerization, polyethylene, elasticity, accelerated life testing, accelerated testing, strength, wood plastic materials, modulus of elasticity

File size: 669 kb(s)

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RITS Product ID: 3023
Current FPL Scientist associated with this product
Stark, Nicole M.
Research Chemical Engineer
  

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