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EFFECT OF SURFACE MODIFICATION AND HYBRIDIZATION IN ENHANCING THE THERMAL PERFORMANCE OF PINEAPPLE LEAF FIBER (PALF)/GLASS REINFORCED POLYPROPYLENE (PP) COMPOSITES.
EFFECT OF SURFACE MODIFICATION AND HYBRIDIZATION IN ENHANCING THE THERMAL PERFORMANCE OF PINEAPPLE LEAF FIBER (PALF)/GLASS REINFORCED POLYPROPYLENE (PP) COMPOSITES.
Pineapple Leaf fibers (PALF) reinforced Polypropylene (PP) composites and PALF/Glass fiber reinforced PP hybrid composites were fabricated using melt blending followed by injection moulding. Maleated Polyolefin (MAPP) was used as a coupling agent to improve the adhesion between the hydrophilic fibers and hydrophobic PP matrix. Incorporation of upto 20 weight % of glass fibers into PALF-PP composites at 20 weight % of PALF and 2 weight % of MAPP, the thermal performance in the composites increased substantially, compared to those of PALF-PP composites. The melting and crystallization temperature increased in case of PALF/Glass fiber PP hybrid composites with MAPP as compared with PALF-PP composites as well as virgin PP. A similar increase in the thermal stability in these composites was also observed from TGA thermograms. Dynamic mechanical analysis also showed that PALF /glass fiber hybrid composites at PALF/glass ratio of 20:20 and 2 weight % MAPP exhibited higher storage modulus over the entire range of temperature from -150 to 150 Degree.C. This indicates improved mechanical properties at higher temperatures thus allowing higher service temperature in the composites. The hybrid composite also exhibited higher glass transition as compared with virgin PP and PALF fiber PP composites with and without MAPP. Flammability study indicated a lower rate of burning and higher oxygen index in PALF/glass ratio of 20:20 and 2 weight % MAPP in presence of magnesium hydroxide flame retardant. Thus it is concluded that the thermal performance of PALF fiber reinforced PP composites can be enhanced by hybridization with the addition of glass fibers for use in high performance engineering applications in particular automotive applications.
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