Morphology, Crystallization and Melting Behavior of Statistical Copolymers of Propylene with Ethylene, 1-Butene, 1-Hexene and 1-Octene

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dc.contributor.authorKumar, Amiten
dc.contributor.committeechairMarand, Hervé L.en
dc.contributor.committeememberReynolds, William T. Jr.en
dc.contributor.committeememberKander, Ronald G.en
dc.contributor.departmentMaterials Science and Engineeringen
dc.date.accessioned2014-03-14T20:39:57Zen
dc.date.adate2001-06-20en
dc.date.available2014-03-14T20:39:57Zen
dc.date.issued2001-06-12en
dc.date.rdate2002-06-20en
dc.date.sdate2001-06-14en
dc.description.abstractIn this thesis, the morphology, crystallization and melting behavior of polypropylene copolymers (propylene/ethylene, propylene/1-butene, propylene/1-hexene and propylene/1-octene) has been examined. The multiple melting behavior has been correlated with the presence of alpha and gamma phases and with the occurrence of cross-hatching morphology. The Crystallization and melting behavior of propylene/ethylene and propylne/1-butene are qualitatively similar and compatible with the expectations that the ethylene and butene comonomers are partly included in the propylene lattice. Propylene/1-hexene and propylene/1-octene copolymers exhibit remarkably similar behavior and morphologies consistent with the expectations that the hexene and the octene comonomers are rigorously excluded from the crystal lattice. The origin and the crystallization time dependence of the multiple melting behavior is very different for these two pairs of copolymers. For PE and PB it is consistent with the melting of parent a-phase lamellae and alpha or gamma-phase daughter lamellae. For PH and PO copolymers it is very similar to that observed for ethylene-octene(EO) and ethylene-styrene(ES) copolymers and compatible with the melting of primary lamellae and secondary mosaic or fringed micellar structures.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-06142001-134722en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06142001-134722/en
dc.identifier.urihttp://hdl.handle.net/10919/33563en
dc.publisherVirginia Techen
dc.relation.haspart1amit.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectalpha and gamma-phaseen
dc.subjectmultiple meltingen
dc.subjectcross-hatchingen
dc.titleMorphology, Crystallization and Melting Behavior of Statistical Copolymers of Propylene with Ethylene, 1-Butene, 1-Hexene and 1-Octeneen
dc.typeThesisen
thesis.degree.disciplineMaterials Science and Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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