Structure-property relationships in poly-(propylene-ethylene) copolymers

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dc.contributor.advisorMarcus, Kashifen_ZA
dc.contributor.authorMange, Siyabongaen_ZA
dc.date.accessioned2016-05-24T09:08:24Z
dc.date.available2016-05-24T09:08:24Z
dc.date.issued1999en_ZA
dc.description.abstractThis thesis examines the relationship between the microstructural and the mechanical properties of poly-(propylene-ethylene) bi-phasic copolymers. The copolymers investigated covered a comonomer content ranging between 4 and 23 percent ethylene. Nine grades were considered, with variables such as the melt flow index, the degree of crystallinity, the molecular weight distribution and the effect of a nucleating agent being examined. These copolymers have been characterised in order to gain a better understanding of the interrelationship between the morphological structure and their physical, mechanical, thermal and thermo-mechanical properties. The toughness of the copolymers can be enhanced at low temperatures by increasing the ethylene content, at the expense of a loss in stiffness. A study of the microstructure using the scanning electron microscope indicates that a good balance between these two properties can be achieved through a uniform size and spatial distribution of the ethylene-propylene rubber particles within the polypropylene homopolymer matrix. The transmission electron microscope shows the ethylene-propylene rubber (EPR) to be agglomerates of smaller particles, with some crystallinity within the EPR being evident.en_ZA
dc.identifier.apacitationMange, S. (1999). <i>Structure-property relationships in poly-(propylene-ethylene) copolymers</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering. Retrieved from http://hdl.handle.net/11427/19804en_ZA
dc.identifier.chicagocitationMange, Siyabonga. <i>"Structure-property relationships in poly-(propylene-ethylene) copolymers."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1999. http://hdl.handle.net/11427/19804en_ZA
dc.identifier.citationMange, S. 1999. Structure-property relationships in poly-(propylene-ethylene) copolymers. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Mange, Siyabonga AB - This thesis examines the relationship between the microstructural and the mechanical properties of poly-(propylene-ethylene) bi-phasic copolymers. The copolymers investigated covered a comonomer content ranging between 4 and 23 percent ethylene. Nine grades were considered, with variables such as the melt flow index, the degree of crystallinity, the molecular weight distribution and the effect of a nucleating agent being examined. These copolymers have been characterised in order to gain a better understanding of the interrelationship between the morphological structure and their physical, mechanical, thermal and thermo-mechanical properties. The toughness of the copolymers can be enhanced at low temperatures by increasing the ethylene content, at the expense of a loss in stiffness. A study of the microstructure using the scanning electron microscope indicates that a good balance between these two properties can be achieved through a uniform size and spatial distribution of the ethylene-propylene rubber particles within the polypropylene homopolymer matrix. The transmission electron microscope shows the ethylene-propylene rubber (EPR) to be agglomerates of smaller particles, with some crystallinity within the EPR being evident. DA - 1999 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1999 T1 - Structure-property relationships in poly-(propylene-ethylene) copolymers TI - Structure-property relationships in poly-(propylene-ethylene) copolymers UR - http://hdl.handle.net/11427/19804 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/19804
dc.identifier.vancouvercitationMange S. Structure-property relationships in poly-(propylene-ethylene) copolymers. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Centre for Materials Engineering, 1999 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/19804en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentCentre for Materials Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherMaterials Engineeringen_ZA
dc.titleStructure-property relationships in poly-(propylene-ethylene) copolymersen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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