The increment of the modulus after exposure was due

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Unformatted text preview: 300 Pulau Pinang, Malaysia E-mail: razaina@eng.usm.my Fiber surface treatment like dewaxing, alkali treatment and acetylation were performed on kenaf fibers in order to improve the mechanical properties of kenaf-polypropylene composites. The effect of fiber surface treatment on water absorption and mechanical properties of kenaf -polypropylene composites have been investigated. The matrix and fiber contents were 70 and 30 % by weight. 5 wt % maleated polypropylene (MAPP) was also added as the compatibilizer agent. Mixing process was performed in an internal mixer. Composites were prepared by using compression moulding and ASTM standard tensile test specimens were cut out of the sheets. Water absorption was carried out by immersing specimens in distilled water at room temperature for 45 days. The process of water absorption was found to follow the kinetics and mechanisms described by Fick’s theory. The diffusion coefficient of moi sture absorption was obtained for composites by measuring water uptake of specimens at regular time intervals. A decrease in tensile properties of the composites was demonstrated showing a great loss in mechanical properties of the water saturated samples compared to the dry samples which are control samples. Fiber surface treatment was found to affect the water uptake of the composite. Among the treated composites, the lowest water uptake was observed for composites with alkali+acetylation treated fibers. The addition of MAPP also improves the mechanical properties and keeps low water absorption values . The surface morphology and fractured surface of kenaf fibers reinforced polypropylene composites were monitored by scanning electron microscopy (SEM) studies. POLY-O16 THE USE OF CHROMIUM-IRON MIXED-METAL COMPLEXES FOR POLYMERIZATION OF ETHYLENE 1 Che Ibrahim Abdullah, Mohd Jamil Maah and Aishah Mohd Jelan 1 2 2 Jabatan Kimia, Fakulti sains, Universiti Malaya, 50603 Kuala Lumpur, Malaysia Pusat Asasi Sains Universiti Malaya, Universiti Malaya, 50603 Kuala Lumpur, Malaysia E-mail: che304@yahoo.com 1 A seri...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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