Evaluation On Flow Behaviour Of Polypropylene/Kaolin Composites At High Shear Stress

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dc.contributor.authorJikan, Suzi Salwah
dc.date.accessioned2018-06-29T01:52:33Z
dc.date.available2018-06-29T01:52:33Z
dc.date.issued2010-12
dc.description.abstractIn this study, Polypropylene (PP)/kaolin composite was compounded on a heated two roll-mill prior to testing via capillary rheometer in order to improve the rheological properties of the samples. Whereas, the extrudate from melt flow indexer (MFI) were analyzed to calculate their melt densities. The results showed that the melt density decreased linearly with an increase in processing temperature and it increased slightly with the addition of kaolin filler. On the other hand, for the investigation of melt flow properties, thermal behaviour, morphological analysis and viscoelastic phenomenon of PP/kaolin composite, the sample was subjected to extrusion process by means of capillary rheometer. The flow behaviour of all samples revealed that the system appears to be pseudoplastic over one range of shear rates but dilatant over another. The influences of kaolin content, processing temperature and shear stress on crystallization of all samples, including isothermal and nonisothermal crystallization behaviour were investigated by differential scanning calorimetry (DSC). The results showed that increasing kaolin content, processing temperature and shear stress have shifted the crystallization exothermic peak to higher temperature and reduced the overall crystallization time. The crystallization activation energy calculated using Kissinger’s method displayed a decreasing trend with increasing kaolin content, processing temperature and shear stress. A study of nucleation activity revealed that kaolin filler had a slight nucleation effect on PP matrix. A thorough observation on nucleation effect also revealed that the incorporation of kaolin in chorus with increasing temperature and shear stress have contributed to successive heterogeneous nucleation in the system. The morphological analysis of the extrudate was analyzed using SEM and EDX in order to investigate the effect of shear stress, processing temperature and filler loading.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5821
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectEvaluation on flow behaviour of Polypropyleneen_US
dc.subjectkaolin composites at High shear stressen_US
dc.titleEvaluation On Flow Behaviour Of Polypropylene/Kaolin Composites At High Shear Stressen_US
dc.typeThesisen_US
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