Tailoring applications-relevant properties in poly(vinylidene fluoride)-based homo-, co- and ter-polymers through modification of their three-phase structure
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Hochschulschrift
Titel:
Tailoring applications-relevant properties in poly(vinylidene fluoride)-based homo-, co- and ter-polymers through modification of their three-phase structure
Weitere Titel:
Übersetzung des Haupttitels: Maßgeschneiderte anwendungsrelevante Eigenschaften in Homo-, Ko- und Ter-Polymeren auf der Basis von Poly(vinylidenfluorid) durch Modifikation ihrer Dreiphasenstruktur
Hochschulschrift:
Dissertation, University of Potsdam, 2022
Dissertation, KU Leuven, Arenberg Doctoral School, 2022
Anmerkungen:
Beschreibung:
Poly(vinylidene fluoride) (PVDF)-based homo-, co- and ter-polymers are well-known for their ferroelectric and relaxor-ferroelectric properties. Their semi-crystalline morphology consists of crystalline and amorphous phases, plus interface regions in between, and governs the relevant electro-active properties. In this work, the influence of chemical, thermal and mechanical treatments on the structure and morphology of PVDF-based polymers and on the related ferroelectric/relaxor-ferroelectric properties is investigated. Polymer films were prepared in different ways and subjected to various treatments such as annealing, quenching and stretching. The resulting changes in the transitions and relaxations of the polymer samples were studied by means of dielectric, thermal, mechanical and optical techniques. In particular, the origin(s) behind the mysterious mid-temperature transition (T_{mid}) that is observed in all PVDF-based polymers was assessed. A new hypothesis is proposed to describe the T_{mid} transition as a result of multiple processes taking place within the temperature range of the transition. [...]