Reduction of Stress Whitening in Polypropylene Hub Cap

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dc.contributor.authorKarunaratitna, D.W.N.
dc.date.accessioned2021-10-26T08:01:19Z
dc.date.available2021-10-26T08:01:19Z
dc.date.issued2014
dc.description.abstractHigh impact polypropylene copolymers have better balance between impact and stiffness because of incorporation of elastomers. But it creates stress whitening on polymer surface. Polypropylene copolymers show stress whitening than Polypropylene homo polymers. Stress whitening occurs on polymeric surface after an impact or pressure or tension is applied to a plastic material, but it does not show immediately after the force. In this study, Stress whitening occurs on polypropylene hubcap surface and HDPE (High Density Polyethylene) and LLDPE (Linear Low Density Polyethylene) used to making plastic composites. There was no stress whitening during the production, it shows after assembling. Polypropylene hub caps were prepared by addition of 5% to 20% level of HDPE and LLDPE. Bending test was done successfully for all samples to determine the maximum pressure can be absorbed by hubcap. Tensile specimens were prepared using injection molding and tensile test (kg/cm2) was done to identify ultimate tensile strength and elongation at break. Hardness (Shore D) was checked of all prepared tensile specimens and compared with current product. Dimensions (mm) was checked of all prepared hub cap and compared with current product. Finally dynamic test (EN 12530) was done for tyres after assembling all samples of hubcaps. The improvement in absorb pressure, tensile strength, and hardness as well as dimensions are documented and discussed for Polypropylene composites. According to the results LLDPE added samples have better properties than HDPE added samples. Key words: Stress whitening, polypropylene hubcap, Bending testen_US
dc.identifier.otherUWU/PLT/14/0021
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/7384/PLT%2014%20021-24022021122718.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;UWU/PLT/14/0021
dc.subjectPalm and Latex Technology and Value Addition Degree Programme ( PLT)en_US
dc.titleReduction of Stress Whitening in Polypropylene Hub Capen_US
dc.title.alternativeResearch Article – PLT 2014en_US
dc.typeThesisen_US
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