STUDY OF THE EFFECTS OF ALKALINE TREATED OKRO BAST FIBRES AS FILLERS IN UNSATURATED POLYESTER RESIN COMPOSITES

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dc.contributor.authorUMAR, IDRIS HINDATU
dc.date.accessioned2017-05-17T08:15:46Z
dc.date.available2017-05-17T08:15:46Z
dc.date.issued2017-01
dc.descriptionA DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER OF SCIENCE DEGREE IN TEXTILE SCIENCE AND TECHNOLOGY. DEPARTMENT OF POLYMER AND TEXTILE SCIENCE, FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY, ZARIA NIGERIAen_US
dc.description.abstractThe study deals with evaluation of properties as well as the morphological analysis of short Okro bast fibre /unsaturated polyester (UPR) composites. The Okro bast fibres were modified using sodium hydroxide at varying concentrations (5%, 10% and 15% NaOH); the fibres were neutralized with 1% acetic acid and finally rinsed with distilled water. The composites were also prepared by hand lay technique adding different weight proportions of Okro fibres (5%, %10%and 15%). The prepared composites where tested for properties in accordance with ASTM methods. The treated Okro bast fibre /unsaturated polyester resin showed moderate improvement in the mechanical properties over the unmodified composites such as tensile strength 22.21 Mpa ,tensile modulus of 287.36 Mpa and percentage elongation (17%) were obtained for 15% alkaline treated okro fibre /unsaturated polyester resin composites at 15% fibre loading, however the control sample has the observed values of 20.83Mpa, 259Mpa and 7.5% respectively. The highest impact strength and hardness were also observed at 15% NaOH treatment 0.65J/m and hardness value of 68.4HRF. The composites shows increase in water absorption with increasing filler loading, and increase in sodium hydroxide concentration with increasing number of days until it attain a saturation period where no water uptake was observed. The result shows that the highest water absorption was observed at 15% alkali treatment and 15% filler loading of Okro bast fibre/unsaturated polyester resin Composites .It was also observed that the density of the composites decreases with increase in filler loading .Scanning electron microscope revealed better adhesion between the treated okro bast fibre and the matrix. However, pullout micro cracks and voids were observed for untreated okro bast fibre/unsaturated polyester resin composites. This composite can add value to Okro bast fibre in composites field and can be used for manufacturing of structural materials for indoor use such as ceiling boards, particle board, partition board and Packaging.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/8996
dc.language.isoenen_US
dc.subjectSTUDY,en_US
dc.subjectEFFECTS,en_US
dc.subjectALKALINE TREATED OKRO BAST FIBRES,en_US
dc.subjectFILLERS,en_US
dc.subjectUNSATURATED POLYESTER RESIN COMPOSITES,en_US
dc.titleSTUDY OF THE EFFECTS OF ALKALINE TREATED OKRO BAST FIBRES AS FILLERS IN UNSATURATED POLYESTER RESIN COMPOSITESen_US
dc.typeThesisen_US
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