Assessment of Mechanical Properties of Hybrid Composites Based on Polypropylene and Vegetable Fibers

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I. O. Oladele
O. G. Agbabiaka
A. S. Ogunbadejo
M. A. Okoro


This research aim at developing hybrid composites from natural fibers with improved mechanical properties targeted in applications where high strength to weight ratio is required. In this work, Homopolymer Polypropylene (PP) was used as matrix material while coconut (cocos nucifera) and sponge (luffa cylindrica) fibers were used as reinforcing material to produce hybrid composites and to evaluate their mechanical properties such as tensile and flexural properties. Selected fibers were locally sourced and extracted. Composites was developed by initially treating the fibers in one molar concentration of sodium hydroxide (NaOH) before mixing in predetermined proportion with polypropylene matrix using coconut/sponge fibers of 2/8, 4/6, 6/4 and 8/2 wt %. The development of hybrid composites was carried out by heating compression moulding technique. From the result of the mechanical properties that were performed on the samples, hybrid composite samples show the highest flexural and tensile strength when compared to monolithic composite samples. Furthermore, all the composites gave better results when compared to the unreinforced PP sample.

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Aart V. V., (2008). "Natural fiber composite; Recent development," Technological Advisor composite materials Sirris, KatholiekeUniversiteitleuven, 1-32.

Agbabiaka O. G., Oladele I. O., and Olorunleye P. O. (2014). "Investigating the influence of alkalization on the mechanical and water absorption properties of coconut and sponge fibers reinforced polypropylene composites," Leonardo Electronic journal of Practices and Technology, 25, 223-231.

Ahmed K. S., Vijayarangan S. and Naidu A. B. (2007). "Elastic properties, notched strength and fracture criterion in untreated woven jute-glass fabric reinforced polyester hybrid composites," Materials and Design, 28(8), 2287.

Brahim S. B., and Cheikh R. B. (2006)."Influence of fibre orientation and volume fraction on the tensile properties of unidirectional alfa–polyester composite," Composite science and technology, 9-10.

Chandramoha D. and Marimuthu K. (2011). "Tensile and hardness test on natural fiber reinforced polymer composite material," International Journal of Advanced engineering sciences and technologies, 6(1), 097-104

Cristiane B., Samuel S., Estevão F., Sandro A., and Ademir Z. (2009). "Characterization of hybrid composites produced with mats made using different methods," Materials Research, 12(4), 433-439.

Ghali L., Aloui M., Zidi M., Bendaly H., M'sahli S., and Sakli F. (2011). "Effect of chemical modification of luffa cylindrica fibers on the mechanical and hygro-thermal behaviours of polyester/luffa composite," BioResources, 6(4), 3836-3849.

Idicula M., Boudenne A., Umadevi L., Ibos L., Candau Y., and Thomas S. (2006). "Thermophysical properties of natural fibre reinforced polyester composites,"Composites Science and Technology, 66(15), 2719.

Jacob M., Thomas S. and Varghese K. T. (2004). "Mechanical properties of sisal/oil palm hybrid fiber reinforced natural rubber composites," Composites Science and Technology, 64 (7– 8), 955–65.

Jarukumjorn K. and Supakarn N. (2009). "Effect of glass fiber hybridization on properties of sisal fiber–polypropylene composites,"Composites Part B, 40(7), 623–627.

Jochen G. and Andrzej K.B. (1999). "Possibilities for improving the mechanical properties of jute/epoxy composites by alkali treatment of fibers," Composites Science and Technology, 59, 1303-1309.

Joshi S. V., Drzal L. T., Mohanty A. K., and Arora S. (2004). "Are natural fiber composites environmentally superior to glass fiber reinforced composites? Composites Part A," Applied science and manufacturing, 35(3), 371.

Madhukiran J., Srinivasa R. S. and Madhusudan S. (2013). "Fabrication and testing of natural fiber reinforced hybrid composites Banana/pineapple," International journal of modern engineering research, 3(4), 2239-2243.

Maries I., Malhotra S. K., Kuruvilla J., and Sabu T. (2005). "Dynamic mechanical analysis of randomly oriented intimately mixed short banana/sisal hybrid fiber reinforced polyester composites," Composites Science and Technology, 65, 1077–1087.

Mukherjee K. G. and Satyanarayana K. (1984). "Structure and properties of some vegetable fibers," Journal of Material Science, 19, 3925–34.

Pavthran C., Mukherjee P. S., and Brahmakumar M. J. (1991). "CoirGlass Intermingled fiber Hybrid Composites," Journal of Reinforced Plastic and Composites, 10(1), 91-101.

Ray D., Sarkara B. K., Rana A. K., and Bose N. R. (2001). "The mechanical properties of vinylester resin matrix composites reinforced with alkali-treated jute fibers," Composite Part A, 32, 119–127.

Saira T., Munawar A. M., and Khan S., (2007). "Natural Fiber reinforced Polymer Composite", Applied Chemistry Research Center, Lahore-54600 University of the Punjab, Lahore, Pakistan.

Saw S. K., Puwar R., Nandy S., Ghose J. and Sarkhel G. (2013). "Fabrication characterization and evaluation of luffa cylindrica fiber reinforced epoxy composites," BioResources, 8(4), 4805-4826.