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dc.contributor.advisorLuyt, A. S.
dc.contributor.advisorGuduri, B. R.
dc.contributor.authorMokhothu, Thabang Hendrica
dc.date.accessioned2015-12-01T08:22:13Z
dc.date.available2015-12-01T08:22:13Z
dc.date.copyright2010-12-07
dc.date.issued2010-12-07
dc.date.submitted2010-12-07
dc.identifier.urihttp://hdl.handle.net/11660/1945
dc.description.abstractThe effects of natural fibre modification with sodium hydroxide, silane and Disperal nanopowder were investigated for copolyester/kenaf fibre biocomposites. The kenaf fibre was modified with sodium hydroxide followed by silane at different concentration (3, 6 and 9%). The 3% silane modified fibre was further modified with Disperal at different concentrations (4, 6, 8 and 10 wt%) as an additive. The biocomposites were prepared by a melt mixing process using a Haake Rheomix mixer. The biocomposites were characterized for their morphology, thermal properties, mechanical properties, thermomechanical properties, biodegradability and the amount of crosslinking. The properties were determined using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), tensile testing, dynamic mechanical analysis (DMA), biodegradability testing and gel content determination. Compatibility of the natural fibre and the copolyester (CP) matrix is necessary as morphology has a significant effect on the composite properties. The SEM images show less fibre pullout for the silane modified composites with increasing concentration. DSC results show that the silane treated composites had a slight shift in the melting temperature due to reduced chain mobility as a result crosslinking or grafting. The melting enthalpy values were too scattered to make definite conclusions on changes in the crystallinities for the silane and Disperal modified composites. The TGA results showed improved thermal stability for the NaOH treated composite compared to both the silane and Disperal modified composites. The DMA results were in line with the other thermal analysis results, and will also be discussed. The biodegradability tests confirmed the biodegradability of the systems.en_ZA
dc.language.isoenen_ZA
dc.publisherUniversity of the Free State (Qwaqwa Campus)en_ZA
dc.subjectDissertation (M.Sc. (Chemistry))--University of the Free State (Qwaqwa Campus), 2010en_ZA
dc.subjectKenafen_ZA
dc.subjectKenaf -- Mechanical propertiesen_ZA
dc.subjectPolyestersen_ZA
dc.subjectFibrous compositesen_ZA
dc.titlePreparation and characterization of natural fibre/co-polyester biocompositesen_ZA
dc.typeDissertationen_ZA
dc.rights.holderUniversity of the Free State (Qwaqwa Campus)en_ZA


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