Mechanical and flame retardant properties of wood flour filled polypropylene composites
2006
M.B. Abu Bakar | Z.A. Mohd. Ishak | H.D. Rozman, | S. Mohamad Jani
Wood flour (WF)filled polypropylene (PP) composites of constant filler content (30% by weight) were preparedusing a twin screw extruder and an injection moulding machine. Various types of ecological friendly flame retardent (FR) based on ammonium polyphosphate (APP) and magnesium hydroxide (MgOH) were used in order to improve flame retardency properties of the composites. The flame retardency of the composites was characterized with the vertical burn test (UL94-V). It was found that, all FR based on APP can effectively reduced the flammability of WF/PP composites by achieving V-O UL94-V classifications. No positive effect, however, was observed when MgOH was used as a flame retardent. In many cases, strength properties decreased but modulus properties increased with the incorporation of FR. The presence of maleic anhydride-grafted-polypropylene (MAPP) resulted to the improvement of fibre-matrix bonding between WF and PP which consequently enchanced the mechanical properties of the PP composites.
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