Browsing by Author "Salem, Tuffaha Fathe Salem"
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thesis.listelement.badge IMPROVEMENT OF MECHANICAL AND PHYSICAL PROPERTIES OF POLYURETHANE ELASTOMER/JUTE FIBER ECO-COMPOSITES BY APPLYING PROPER TREATMENTS TO FIBER SURFACES(2017-07-02) Salem, Tuffaha Fathe Salem; TİRKEŞ, Seha; TAYFUN, ÜmitIn this study, chopped jute fiber (JF) samples were surface treated by alkaline (Na), silane(Si) and eco-grade epoxy resin(EP). Surface characteristics of jute fibers were examined by FTIR and EDX analysis. JF filled polyurethane elastomer (TPU) composites were prepared via melt compounding. The effect of surface modifications of JF on mechanical, damping, melt-flow and morphological properties of TPU based eco-composites were investigated by performing tensile and Shore hardness tests, dynamic mechanical analysis (DMA), melt flow index (MFI) test and scanning electron microscopy (SEM) techniques, respectively. Mechanical test results showed that silane and epoxy treated JF improved the tensile strength and tensile modulus of unfilled TPU. Elongation at break of TPU decreased drastically with all kind of JF inclusions. All of the surface treatments resulted increase in hardness value of TPU. Similarly with mechanical test results, Si-JF and EP-JF containing composites showed enhancement on storage modulus. Glass transition temperature (Tg) of TPU rised up to higher temperatures after JF additions. Inclusions of JF caused increase for MFI value of neat TPU. Silane and epoxy treated JFs displayed homogeneous dispersion into TPU and their surface were covered by polymer phase according to SEM microphotographs.