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23 results on '"Akindoyo, John O."'

3. Reactive compatibilization of harakeke fiber‐reinforced poly(lactic) acid/polybutylene succinate blend.

Author

Akindoyo, John O., Pickering, Kim, Beg, Mohammad Dalour, and Mucalo, Michael

Subjects
THERMOMECHANICAL properties of metals, DYNAMIC mechanical analysis, TENSILE strength, DICUMYL peroxide, THERMAL properties
Abstract

Different blends of poly(lactic acid) (PLA) and polybutylene succinate (PBS), and their harakeke fiber‐reinforced composites were studied. Scanning electron microscopy showed that the PLA and PBS are incompatible and poorly miscible. Tensile strength and tensile modulus of the blends were found to reduce as the amount of PBS increased. Reinforcement alone was not able to significantly improve the mechanical performance of the blend, which is lower than that of neat PLA. Therefore, simultaneous reinforcement and reactive compatibilization were performed using harakeke fiber, and dicumyl peroxide as reinforcement and compatibilizer, respectively. This produced about 201% increase in the crystallinity of PLA. Compared with the PLA/PBS blend, the dual effect approach increased the tensile strength and tensile modulus by 31% and 148%, respectively. Likewise, dynamic mechanical analysis showed that the thermomechanical properties of the composite greatly improved. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Synergized high‐load bearing bone replacement composite from poly(lactic acid) reinforced with hydroxyapatite/glass fiber hybrid filler—Mechanical and dynamic mechanical properties.

Author

Akindoyo, John O., Beg, M.D.H., Ghazali, S., Heim, H‐P., Feldmann, M., and Mariatti, M.

Subjects
*HYDROXYAPATITE, *LACTIC acid, *HETEROGENOUS nucleation, *FLEXURAL modulus, *BONES, *IMPACT strength
Abstract

High‐load bearing bone replacement composite was produced from poly(lactic acid) (PLA), surface modified hydroxyapatite (HA) and glass fiber (GF). Composition dependence and other salient properties of the composites were investigated with respect to the mechanical and dynamic mechanical performance of the composites. Incorporation of modified HA facilitates dispersion, improves bonding, as well as induce heterogeneous nucleation in the PLA matrix. On the other hand, GF greatly influenced the mechanical properties of the composite. The effectiveness coefficient, C, and adhesion factor, A, showed that incorporation of hybrid HA/GF filler helps to improve interfacial interaction due to increased bonding among the components, which produced remarkable enhancement in mechanical performance. For instance, tensile and flexural modulus of the PLA‐HA‐GF composite was raised by 86% and 82%, respectively. In addition, whereas incorporation of HA alone resulted in decreased impact strength (IS) of PLA, the IS of the PLA‐HA‐GF composite improved by 42%. Furthermore, damping of the ternary composite was reduced by 34% whereas the storage modulus is 1273 MPa higher than neat PLA. Therefore, hybrid HA/GF reinforced PLA offers alternative possibility for the fabrication of composites suitable for use in bone replacement and other orthopedic applications requiring high‐load bearing materials. [ABSTRACT FROM AUTHOR]

Published
2021
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18. Impact Modified Oil Palm Empty Fruit Bunch Fiber/Poly(Lactic) Acid Composite

Author

Beg, Mohammad D. H., Akindoyo, John O., Suriati Ghazali, and Mamun, Abdullah A.

Subjects
natural fibers, impact modifier, ultrasound, Fiber treatment
Abstract

In this study, composites were fabricated from oil palm empty fruit bunch fiber and poly(lactic) acid by extrusion followed by injection moulding. Surface of the fiber was pre-treated by ultrasound in an alkali medium and treatment efficiency was investigated by scanning electron microscopy (SEM) analysis and Fourier transforms infrared spectrometer (FTIR). Effect of fiber treatment on composite was characterized by tensile strength (TS), tensile modulus (TM) and impact strength (IS). Furthermore, biostrong impact modifier was incorporated into the treated fiber composite to improve its impact properties. Mechanical testing showed an improvement of up to 23.5% and 33.6% respectively for TS and TM of treated fiber composite above untreated fiber composite. On the other hand incorporation of impact modifier led to enhancement of about 20% above the initial IS of the treated fiber composite., {"references":["K. Oksman, M. Skrifvars, and J.-F. Selin, \"Natural fibres as\nreinforcement in polylactic acid (PLA) composites,\" Composites science\nand technology, vol. 63, pp. 1317-1324, 2003.","S. Mohanty, S. K. Verma, S. K. Nayak, and S. S. Tripathy, \"Influence of\nfiber treatment on the performance of sisal–polypropylene composites,\"\nJournal of Applied Polymer Science, vol. 94, pp. 1336-1345, 2004.","B. Bax and J. Müssig, \"Impact and tensile properties of PLA/Cordenka\nand PLA/flax composites,\" Composites Science and Technology, vol.\n68, pp. 1601-1607, 2008.","N. Graupner, A. S. Herrmann, and J. Müssig, \"Natural and man-made\ncellulose fibre-reinforced poly (lactic acid)(PLA) composites: An\noverview about mechanical characteristics and application areas,\"\nComposites Part A: Applied Science and Manufacturing, vol. 40, pp.\n810-821, 2009.","M. S. Huda, L. T. Drzal, A. K. Mohanty, and M. Misra, \"Effect of fiber\nsurface-treatments on the properties of laminated biocomposites from\npoly (lactic acid)(PLA) and kenaf fibers,\" Composites Science and\nTechnology, vol. 68, pp. 424-432, 2008.","L. Petersson, I. Kvien, and K. Oksman, \"Structure and thermal\nproperties of poly (lactic acid)/cellulose whiskers nanocomposite\nmaterials,\" Composites Science and Technology, vol. 67, pp. 2535-2544,\n2007.","M. Islam, M. Beg, A. Gupta, and M. Mina, \"Optimal performances of\nultrasound treated kenaf fiber reinforced recycled polypropylene\ncomposites as demonstrated by response surface method,\" Journal of\nApplied Polymer Science, vol. 128, pp. 2847-2856, 2013.","A. Moshiul Alam, M. Beg, D. Reddy Prasad, M. Khan, and M. Mina,\n\"Structures and performances of simultaneous ultrasound and alkali\ntreated oil palm empty fruit bunch fiber reinforced poly (lactic acid)\ncomposites,\" Composites Part A: Applied Science and Manufacturing,\nvol. 43, pp. 1921-1929, 2012.","M. Islam, K. Pickering, and N. Foreman, \"Influence of alkali treatment\non the interfacial and physico-mechanical properties of industrial hemp\nfibre reinforced polylactic acid composites,\" Composites Part A:\nApplied Science and Manufacturing, vol. 41, pp. 596-603, 2010.\n[10] X. Li, L. G. Tabil, and S. Panigrahi, \"Chemical treatments of natural\nfiber for use in natural fiber-reinforced composites: a review,\" Journal of\nPolymers and the Environment, vol. 15, pp. 25-33, 2007.\n[11] K. Sever, M. Sarikanat, Y. Seki, G. Erkan, Ü. H. Erdoğan, and S. Erden,\n\"Surface treatments of jute fabric: the influence of surface characteristics\non jute fabrics and mechanical properties of jute/polyester composites,\"\nIndustrial Crops and Products, vol. 35, pp. 22-30, 2012.\n[12] M. Chowdhury, M. Beg, M. R. Khan, and M. Mina, \"Modification of oil\npalm empty fruit bunch fibers by nanoparticle impregnation and alkali\ntreatment,\" Cellulose, vol. 20, pp. 1477-1490, 2013.\n[13] B. K. Goriparthi, K. Suman, and N. Mohan Rao, \"Effect of fiber surface\ntreatments on mechanical and abrasive wear performance of\npolylactide/jute composites,\" Composites Part A: Applied Science and\nManufacturing, vol. 43, pp. 1800-1808, 2012.\n[14] S. K. Saw, G. Sarkhel, and A. Choudhury, \"Surface modification of coir\nfibre involving oxidation of lignins followed by reaction with furfuryl\nalcohol: Characterization and stability,\" Applied Surface Science, vol.\n257, pp. 3763-3769, 2011.\n[15] N. Sgriccia, M. Hawley, and M. Misra, \"Characterization of natural fiber\nsurfaces and natural fiber composites,\" Composites Part A: Applied\nScience and Manufacturing, vol. 39, pp. 1632-1637, 2008.\n[16] M. Jacob, S. Thomas, and K. Varughese, \"Natural rubber composites\nreinforced with sisal/oil palm hybrid fibers: Tensile and cure\ncharacteristics,\" Journal of applied polymer science, vol. 93, pp. 2305-\n2312, 2004.\n[17] S. Joseph, K. Joseph, and S. Thomas, \"Green composites from natural\nrubber and oil palm fiber: physical and mechanical properties,\"\nInternational Journal of Polymeric Materials, vol. 55, pp. 925-945, 2006.\n[18] A. A. Mamun, H.-P. Heim, D. H. Beg, T. S. Kim, and S. H. Ahmad,\n\"PLA and PP composites with enzyme modified oil palm fibre: A\ncomparative study,\" Composites Part A: Applied Science and\nManufacturing, vol. 53, pp. 160-167, 2013.\n[19] A. K. Bledzki, A. A. Mamun, and M. Feldmann, \"Polyoxymethylene\ncomposites with natural and cellulose fibres: Toughness and heat\ndeflection temperature,\" Composites Science and Technology, vol. 72,\npp. 1870-1874, 2012.\n[20] B. Wirjosentono, P. Guritno, and H. Ismail, \"Oil palm empty fruit bunch\nfilled polypropylene composites,\" International Journal of Polymeric\nMaterials, vol. 53, pp. 295-306, 2004.\n[21] S. Ochi, \"Mechanical properties of kenaf fibers and kenaf/PLA\ncomposites,\" Mechanics of materials, vol. 40, pp. 446-452, 2008.\n[22] A. Rana, A. Mandal, and S. Bandyopadhyay, \"Short jute fiber reinforced\npolypropylene composites: effect of compatibiliser, impact modifier and\nfiber loading,\" Composites Science and Technology, vol. 63, pp. 801-\n806, 2003."]}

Published
2015
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22. The effects of wettability, shear strength, and Weibull characteristics of fiber-reinforced poly(lactic acid) composites.

Author

Akindoyo, John O., Hossen Beg, Mohammad Dalour, Ghazali, Suriati, and Islam, Muhammad Remanul

Subjects
WETTING, SHEAR strength, SHEAR (Mechanics), MECHANICAL strength of condensed matter, STRENGTH of materials, LACTIC acid fermentation
Abstract

The wettability, interfacial shear strength (IFSS), and Weibull characteristics of oil palm empty fruit bunch (EFB) fibers were studied to evaluate the mechanical properties of EFB- and poly(lactic acid) (PLA)-based composites. The fiber surface was modified through ultrasound and poly(dimethyl siloxane) treatment. The effects of treatment on the morphology, wettability, and structure of fibers were examined by scanning electron microscopy, contact angle, and Fourier transform infrared spectroscopy analysis, respectively. In addition, the Weibull characteristic was used to find the variability in strength of the fibers with respect to surface treatment. Furthermore, the IFSS of EFB fiber-PLA sandwich was investigated through single-fiber pull-out test, using a less strenuous technique. The mechanical properties (tensile strength, tensile modulus, flexural strength, and flexural modulus) of the composites were determined through mechanical testing. A comparison was drawn among the properties of PLA, raw EFB fiber-based composites, and treated EFB fiber-based composites. Additionally, the inter- and intrarelationship of fiber treatment, wettability, and IFSS with the mechanical properties of the PLA/EFB composites were also accounted. [ABSTRACT FROM AUTHOR]

Published
2016
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23. Synergized poly(lactic acid)–hydroxyapatite composites: Biocompatibility study.

Author

Akindoyo, John O., Beg, Mohammad D. H., Ghazali, Suriati, Alam, A. K. M. M., Heim, Hans P., and Feldmann, Maik

Subjects
COMPOSITE materials, POLYMERS, POLYLACTIC acid, HYDROXYAPATITE, BIOCOMPATIBILITY
Abstract

In vitro biocompatibility of impact modified composites produced from poly(lactic acid) (PLA) and hydroxyapatite (HA) is reported in this study. Surface modification was previously used to facilitate the dispersion of HA in PLA, whereas impact property of the PLA‐HA composites was deliberately enhanced as it was necessary. Herein, osteoblast cell culture assay was used to assess the possible effects of HA surface modification and impact modification on the cell behavior in physiological media. Furthermore, antimicrobial properties of the HA were assessed. Evidence of HA modification was confirmed through elemental and spectroscopic analysis. Incorporation of HA offered better cell attachment and proliferation to the PLA matrix, with significant increase in the cell viability (%). Also, modification of HA did not present obvious cytotoxicity to the PLA‐HA composite. Conversely, incorporation of impact modifier slowed down the rate of cell proliferation on the composite surface but facilitates increased wettability. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47400. [ABSTRACT FROM AUTHOR]

Published
2019
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