Please use this identifier to cite or link to this item: http://hdl.handle.net/10603/3587
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dc.coverage.spatialPolymer Scienceen_US
dc.date.accessioned2012-04-23T05:45:22Z-
dc.date.available2012-04-23T05:45:22Z-
dc.date.issued2012-04-23-
dc.identifier.urihttp://hdl.handle.net/10603/3587-
dc.description.abstractInvestigations on the fracture behaviour of polymer blends is the topic of this thesis. The blends selected are PPIHDPE and PSIHIPS. PP/HDPE blend is chosen due to its commercial importance and PSIHIPS blend is selected to study the transition from brittle fracture to ductile fracture. PP/HDPE blends were prepared at different compositions by melt blending at 180°C and fracture failure process was investigated by conducting notch sensitivity test and tensile test at different strain rates. The effects of two types of modifiers (particulate and elastomer) on the fracture behaviour and notch sensitivity of PP/HDPE blends were studied. The modifiers used are calcium carbonate, a hard particulate filler commonly used in plastics and Ethylene Propylene Diene Monomer (EPDM). They were added in 2%, 4% and 6% by weight of the blends. The study shows that the mechanical properties of PP/HDPE blends can be optimized by selecting proper blend compositions. The selected modifiers are found to alter and improve the fracture behaviour and notch sensitivity of the blends. Particulate fillers like calcium carbonate can be used for making the mechanical behaviour more stable at the various blend compositions. The resistance to notch sensitivity of the blends is found to be marginally lower in the presence of calcium carbonate. The elastomeric modifier EPDM produces a better stability of the mechanical behaviour. A low concentration of EPDM is sufficient to effect such a change. EPDM significantly improves the resistance to notch sensitivity of the blends. The study shows that judicious selection of modifiers can improve the fracture behaviour and notch sensitivity of PPIHDPE blends and help these materials to be used for critical applications. For investigating the transition in fracture behaviour and failure modes, PS/HIPS blends were selected. The blends were prepared by melt mixing followed by injection moulding to prepare the specimens for conducting tensile, impact and flexure tests. These tests were used to simulate the various conditions which promote failure. The tensile behaviour of unnotched and notched PS/HIPS blend samples were evaluated at slow speeds. Tensile strengths and moduli were found to increase at the higher testing speed for all the blend combinations whereas maximum strain at break was found to decrease.en_US
dc.format.extentix, 127p.en_US
dc.languageEnglishen_US
dc.relationNo. of referenecs 70en_US
dc.rightsuniversityen_US
dc.titleStudies on the fracture behaviour of polymer blends with special reference to PP/HDPE and PP/HIPS blendsen_US
dc.creator.researcherVarma P R, Deviprasaden_US
dc.subject.keywordPolymer Scienceen_US
dc.subject.keywordPolymer blendsen_US
dc.description.noteSummary and conclusions p. 117-121, References p. 122-127en_US
dc.contributor.guideSreejith, P Sen_US
dc.contributor.guideGeorge, K Een_US
dc.publisher.placeCochinen_US
dc.publisher.universityCochin University of Science and Technologyen_US
dc.publisher.institutionSchool of Engineeringen_US
dc.date.registeredn.d.en_US
dc.date.completed26/11/2010en_US
dc.date.awarded2010en_US
dc.format.accompanyingmaterialNoneen_US
dc.type.degreePh.D.en_US
dc.source.inflibnetINFLIBNETen_US
Appears in Departments:School of Engineering

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01_title.pdfAttached File94.53 kBAdobe PDFView/Open
02_declaration.pdf30.06 kBAdobe PDFView/Open
03_certificate.pdf28.48 kBAdobe PDFView/Open
04_acknowledgements.pdf64.91 kBAdobe PDFView/Open
05_abstract.pdf130.93 kBAdobe PDFView/Open
06_table of contents.pdf95.6 kBAdobe PDFView/Open
07_chapter 1.pdf876.32 kBAdobe PDFView/Open
08_chapter 2.pdf1 MBAdobe PDFView/Open
09_chapter 3.pdf711.9 kBAdobe PDFView/Open
10_chapter 4.pdf661.79 kBAdobe PDFView/Open
11_chapter 5.pdf993.57 kBAdobe PDFView/Open
12_chapter 6.pdf544.07 kBAdobe PDFView/Open
13_chapter 7.pdf214.24 kBAdobe PDFView/Open
14_references.pdf172.38 kBAdobe PDFView/Open
15_list of abbreviations & symbols.pdf52.86 kBAdobe PDFView/Open
16_curriculum vitae.pdf30.5 kBAdobe PDFView/Open


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