Cassava Peel - Cowpea Hull Blended Agro-Waste Fillers: Effect on Mechanical, Morphological and Degradation Properties of Polypropylene

Abstract: This study is aimed at harnessing the effect of cassava peel and cowpea hull blended agro-waste on the mechanical, morphological and degradation properties of polypropylene and recycled polypropylene. Fine powders of mesh size of 75µm cassava peel and cowpea hull were homogeneously mixed at the ratio of 50:50 to form the hybrid filler. The virgin pellets of PP and recycled polypropylene (rPP) were filled with varying weight percentages (5, 10, 15, 20) of the blended filler and the composites produced via injection moulding technique. The mechanical properties; tensile strength, percentage elongation at break, hardness, compressive strength, and shear modulus were studied according to American Society for Testing and Materials (ASTM) standards. The morphological properties were studied with a Scanning Electron Microscope at 10,000 magnifications. The degradation study was achieved by soil burial method for one hundred and eighty (180) days period. The results of the mechanical properties showed increased tensile strength, hardness, compressive strength and shear modulus while the percentage elongation at break decreased as the filler load increases. The micrographs showed that the virgin PP has better adhesion and interfacial bonding with the filler than the rPP. Biodegradation test revealed a reduction in the mass of the composites after one hundred and eighty (180) days burial period indicating that the composite is degradable. From the findings, the cassava peel-cowpea hull blended filler can be used in materials where stiffness and strength is required. Hence, it is suggested that agro-wastes such as cassava peel and cowpea hulls could be used as fillers in production of degradable plastics as they are readily available, cheap and easy to use.

Cassava peel, Cowpea hull, Polypropylene, Degradation, Mechanical properties, Morphological properties

1. Aisien, E. T. and Ikenebomhe, M. J. (2017). Enhancing the biodegradation process of cassava (Manihot esculenta Crantz) peels in dump site. Nigerian Journal of Biotechnology Vol. 33: 97-105. DOI: https://dx.doi.org/10.4314/v33i1.14 [Google Scholar] [Crossref]

2. Chamas,A., Moon, H., Zheng, J., Qiu, Y., Tabassum, T., Jang, J.H., Abu-Omar, M., Scott, S.L and Suh, S. (2020). Degradation Rates of Plastics in the Environment. ACS Sustainable Chem. Eng. 8: 3494−3511. . https://dx.doi.org/10.1021/acssuschemeng.9b06635 [Google Scholar] [Crossref]

3. Chan, M. Y., Salmah, H. and Nurul, A.B.(2016).Properties of recycled polypropylene/chloroprene rubber blends: The effects of dynamic vulcanization. Journal of Physical Science, 27(3): 121–136. http://dx.doi.org/10.21315/jps2016.27.3.8. [Google Scholar] [Crossref]

4. Chris-Okafor, P., Okonkwo, C. and Ohaeke, M., (2018). Reinforcement of High Density Polye thene with Snail Shell Powder, American Journal of Polymer Science, 8 (1): 17-21. Doi.10.5923/j.ajps.20180801.03 [Google Scholar] [Crossref]

5. Fried, J. R., (2009). Polymer Science and Technology, 2nd Ed. PHI Learning Private Ltd., New Delhi. ISBN: 978-81-203-2770-2. [Google Scholar] [Crossref]

6. (6) Glaser, J. A. (2019). Biological Degradation of Polymers in the Environment. Intechopen 1: 1-22. DOI: http://dx.doi.org/10.5772/intechopen.85124 [Google Scholar] [Crossref]

7. Jacob, J. and Mamza, P. A. P., (2021). Mechanical and thermal behavior of plantain peel powder filled recycled polyethylene composites. Ovidius University Annals of Chemistry, 32 (2):114 – 119. DOI: 10.2478/auoc-2021-0017 [Google Scholar] [Crossref]

8. Jumaidin, R., Sapuana, S. M., Jawaid, M., Ishak, M. R. and Sahariea, J. (2017). Effect of seaweed on mechanical, thermal, and biodegradation properties of thermoplastic sugar palm starch/agar composites. International Journal of Biological Macromolecules, 99: 265–273 [Google Scholar] [Crossref]

9. Nwokoye, J.N., Okoye, P.A.C and Chris-Okafor, P.U. (2024). Impact of Hybrid Biomass Fillers on the Physico-Mechanical and Degradation Properties of Utility Polymers. International Journal of Research and Innovation in Applied Science, 9(9):523-532.https://doi.org/10.51584/IJRIAS.2024 [Google Scholar] [Crossref]

10. Ofora, P. U., Arinze, R. U., Onyema, C. T., Omaka, J. U., Ekwueme J. I., and Nwokoye, J. N. (2016b). Studies on the Mechanical Properties of Dioscorea Dumetorum Starch Filled Linear Low-Density Polyethylene Composites. AIS International Journal of Materials Chemistry and Physics, 2(1): 5-8. [Google Scholar] [Crossref]

11. Ofora, P. U., Nwokoye, J.N., Ekpunobi, E.U., Okpalaunegbu, C.A. and Ezeanyika, M. (2016a). Effects of Bamboo-Corn Husk as Fillers on the Mechanical Properties in Polypropylene. International Journal of Materials Chemistry and Physics 2(2):88-92 http://www.aiscience.org/journal/ijmcp [Google Scholar] [Crossref]

12. Ogudo, M.C., Chris-Oka for, P.U., Nwokoye, J.N. and Anekwe, J.O. (2021). Mixed Agrowaste Biocomposites of Low Density Polyethene; Impact of Fillers on Mechanical, Morphological, Water Imbibition and Biodegradability Properties. American Journal of Polymer Science and Technology. 7 (3):44-49. doi: 10.11648/j.ajpst.20210703.12 [Google Scholar] [Crossref]

13. Onuegbu, G. C. and. Igwe, I. O. (2011). The Effects of Filler Contents and Particle Sizes on the Mechanical and End-Use Properties of Snail Shell Powder Filled Polypropylene. Materials Sciences and Applications, 2(7): 810-816. doi: 10.4236/msa.2011.27110. [Google Scholar] [Crossref]

14. Onyenweaku, C.E., Nwokoye, J.N. and Chris-Oka for, P.U (2021). Mechanical and Surface Morphology Properties of Low Density Polyethylene Composites Filled with Organic Materials. American Journal of Mechanical and Materials Engineering. 5 (1): 1-4. doi: 10.11648/j.ajmme.20210501.11 [Google Scholar] [Crossref]

15. Rajesh, G., Nadh, B.H and Guduru, R.C.C. (2018) Evaluating Tensile Properties of Animal and Hybrid Fiber Reinforced Polyester Composites. IOP Conf. Series: Materials Science and Engineering 390: 1-7. doi:10.1088/1757-899X/390/1/012011 [Google Scholar] [Crossref]

16. Shaharuddin, K., Faridah, K., Mohammad, D.H.B. and Mohd, B.M.P. (2017). Physical and Mechanical Properties of LDPE incorporated with different starch sources. IOP Conference Series: Materials Science and Engineering 226 012157. doi: 10.1088/1757-899X/226/1/012157. [Google Scholar] [Crossref]

17. Sindhu, P. S. (2010). Environmental Chemistry, 2nd Ed. New Age International (P) Limited, Publishers, New Delhi. ISBN: 978-81-224-2731-8. [Google Scholar] [Crossref]

18. Thompson, R. C., Moore C. J., Vom Saal, F. S., and Swan, S. H. (2009). Plastics, the Environment and Human Health: Current Consensus and Future Trends. Philos Trans R. Soc. Lond. B Biol Sci., 364(1526): 2153-2166. Doi: 10.1098/rstb.2009.0053. PMC2873021. [Google Scholar] [Crossref]

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