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    Author(s): Magnus Bengtsson; Nicole M. Stark; Kristiina Oksman
    Date: 2007
    Source: Composites science and technology. Vol. 67 (2007): pages 2728-2738.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (669 KB)

    Description

    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.

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Bengtsson, Magnus; Stark, Nicole M.; Oksman, Kristiina. 2007. Durability and mechanical properties of silane cross-linked wood thermoplastic composites. Composites Science and Technology. 67(13): 2728-2738.

    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

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