Modification of flax fibers and application in composites

Details Modification of flax fibers and application in composites Modification of flax fibers and application in composites

D - Textiles, Paper

06

M

D06M 13/10 (2006.01)

Patent

CA 2473319

In recent years, the interest in using natural flax fibers in biocomposites has grown because They are lightweight, combustible, non-toxic, low cost and easy to recycle. On tue other hand, lack of good interfacial adhesion and poor resistance to moisture absorption make the use of natural fiber-reinforced composites less attractive. Chemical treatment of the fiber can stop the moisture absorption process, clean the fiber surface, chemically modify the surface or inerease the surface roughness. Short flax fibers, which were derived from Saskatchewan- grown flax straws, for use in fiber-reinforced composites. were mercerized and modified by silane treatment, benzoylation and peroxide treatment. Morphological and structural changes of the fibers were investigated by using scanning electron microscopy. The temperature variation method vas applied to obtain the melting point of treated flax fibers by the DSC technique. The moisture absorption and bundle flax fiber tensile strength were also measured. Natural flax fiber-reinforced composites have enhanced biodegradability, are lightweight, non-corrosive, temperature resistant and low environmental pollution. These advantages place natural fiber composites among the high performance composites having economic and environmental advantages. In the field of technical utilization of plant fibers, flax fiber- reinforced composites represent one of the most important areas, But high level of moisture absorption, poor wettability and insufficient adhesion between untreated fiber and the polymer matrix may lead to debanding with age. In order to improve the above qualities, various surface treatments of fibers like silane treatment, benzoylation and peroxide treatment were carried out which may result in improved mechanical performance of fiber composites. Short flax fibers were derived from Saskatchewan-grown flax straws, for use in fiber-reinforced composites Composites consisting of high-density polyethylene (HDPE) or linear low- density polyethylene (LLDPE) or HDPE/LLDPE, chemical treated fibers and additives were prepared by an extrusion process. The test samples were prepared by rotational molding. The effects of the different chemical treatments on the mechanical properties of natural fiber-reinforced composites were evaluated. The tensile fracture surfaces of the samples were characterized by scanning electron microscopy to determine whether the modified fiber-matrix interface had improved interfacial bonding.

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