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dc.contributor.advisorSüzer, Şefiken_US
dc.contributor.authorTürkçü, Harun Nezihen_US
dc.date.accessioned2016-07-01T11:00:56Z
dc.date.available2016-07-01T11:00:56Z
dc.date.issued2004
dc.identifier.urihttp://hdl.handle.net/11693/29530
dc.descriptionCataloged from PDF version of article.en_US
dc.description.abstractHaving good mechanical and barrier properties, polypropylene films are widely used in food-packing industry. The relation of crystallinity and orientation of polypropylene with these properties are well known. Temperature increase has an important effect on the crystallinity and orientation of polypropylene. The purpose of this study is to understand better crystallinity and orientation changes of the cast and bi-axially oriented polypropylene films with respect to temperature effect. These changes were investigated using especially in-situ FT-IR and dichroism as well as XRD and Raman spectroscopy. For this purpose, an in-situ variable temperature set-up is developed and adapted for FT-IR studies. Accordingly, the changes in the peaks related to the amorphous and crystalline contents of the films as well as the peaks reflecting the orientation of the films were investigated over the temperature range from 120-170o C. Temperature cycle was also applied. Moreover, the films were investigated after application of additional stress at 120o C for various durations. The crystallinity and orientation of the films are affected significantly when the films were analyzed at higher temperature (>150o C). The crystallinity content of the film recovers after returning back to room temperature whereas orientational loss are permenant.en_US
dc.description.statementofresponsibilityTürkçü, Harun Nezihen_US
dc.format.extentxiii, 70 leavesen_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectPolypropyleneen_US
dc.subjectPhase Transition and Temperature Effecten_US
dc.subjectRaman Spectroscopyen_US
dc.subjectXRDen_US
dc.subjectDichroismen_US
dc.subjectFT-IRen_US
dc.subject.lccTP1180 .T87 2004en_US
dc.subject.lcshPolypropylene.en_US
dc.titleInvestigation of the crystallinity and orientation of polypropylene with respect to temperature changes using FT-IR, WRD, and Raman techniquesen_US
dc.typeThesisen_US
dc.departmentDepartment of Chemistryen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US
dc.identifier.itemidBILKUTUPB083927


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