Micro-and-Nanostructuring of Polyvinylidene Fluoride with Tailored Crystal Polymorphs and Enhanced Piezoelectric Property

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dc.contributor.advisorLeung, Siu-Ning
dc.creatorLee, Ji Eun
dc.date.accessioned2018-11-21T13:58:23Z
dc.date.available2018-11-21T13:58:23Z
dc.date.copyright2018-08-29
dc.date.issued2018-11-21
dc.date.updated2018-11-21T13:58:23Z
dc.degree.disciplineMechanical Engineering
dc.degree.levelMaster's
dc.degree.nameMASc - Master of Applied Science
dc.description.abstractPolyvinylidene fluoride (PVDF) has garnered interest due to its piezoelectric property and as a non-toxic, conformable, and low-cost alternative to the popular piezoelectric ceramic. A novel processing method through the combination of thermal and supercritical carbon dioxide (ScCO2) has been used to successfully promote the formation of electroactive phases (i.e., beta and gamma phases), as well as its piezoelectric property. In this report, the processing-to-structure properties and mechanisms that affect crystallization behaviors of electroactive phases were elucidated. It was revealed that gamma crystal formation was through thermal processing while beta phase was nucleated through fast cooling and physical foaming of CO2 bubbles. The results were comparable to common processing method and literature, with a maximum electroactive crystal phase of 72.2% and a corresponding piezoelectric coefficient of 7.7 pC/N. The findings in this study could provide insight to future research work on PVDF, advancing its development in piezoelectric applications.
dc.identifier.urihttp://hdl.handle.net/10315/35596
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectAlternative energy
dc.subject.keywordsPVDF
dc.subject.keywordsPolyvinylidene fluoride
dc.subject.keywordsPiezoelectric
dc.subject.keywordsElectroactive
dc.subject.keywordsCrystalllinity
dc.subject.keywordsCrystal structures
dc.subject.keywordsPiezoelectric property
dc.subject.keywordsBeta
dc.subject.keywordsGamma
dc.subject.keywordsMorphology
dc.subject.keywordsBubble nucleation
dc.subject.keywordsSupercritical
dc.subject.keywordsCarbon dioxide
dc.subject.keywordsProcessing
dc.subject.keywordsPhysical foaming
dc.subject.keywordsIsothermal
dc.subject.keywordsNon-isothermal
dc.subject.keywordsFast cooling
dc.subject.keywordsAlternative energy
dc.titleMicro-and-Nanostructuring of Polyvinylidene Fluoride with Tailored Crystal Polymorphs and Enhanced Piezoelectric Property
dc.typeElectronic Thesis or Dissertation

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