Polyolefin composites with natural fibers and wood-modification of the fiber/filler-matrix interaction

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[1] Sobczak, L.
[2] Brüggemann, O.
[3] Putz, R.F.
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Sobczak, L. (l.sobczak@klus-wood.at) | 1600年 / John Wiley and Sons Inc卷 / 127期
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Numerous strategies to improve the fiber-matrix interaction in natural fiber composites (NFCs) and wood polymer composites (WPCs) have been proposed and investigated. We have reviewed literature on polyolefin-based NFCs and WPCs to get an overview of the current state of the art of compatibilization methods. Those are classified in two categories here; namely fiber-based strategies and matrix-based strategies. Although this issue has been covered by several reviews before; as yet no work exists that is focused on polyolefin-based NFCs and WPCs. Furthermore; a ranking of the compatibilization methods based on their effects on material properties such as tensile/flexural strength and modulus; impact strength and water absorption; allows for an assessment of the efficiency of the various methods. As to the fiber-based strategies; silanes; maleated polyolefins (MA-POs); mercerization and acetylation are most thoroughly investigated. Silanes are most effective judged by achievable material property improvements; allowing for increases in tensile and flexural strength of more than 100%. Among the matrix-based strategies; MA-POs and isocyanates are most prominent in the literature. The first class enables the more significant material improvements; with reported increases of tensile and flexural strength of 132% and 85%; respectively. While strengths can be enhanced by many compatibilization methods; moduli; and impact strength (notched in particular) are in most cases improved to a lesser degree or even reduced. Especially; the last point calls for further attention; because impact strength is still a weak point of NFCs and WPCs. Copyright © 2012 Wiley Periodicals; Inc;
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