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Origin of the Anisotropy and Structure of Ellipsoidal Polyfluorene Nanoparticles

Origin of the Anisotropy and Structure of Ellipsoidal Polyfluorene Nanoparticles

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SICKINGER, Annika, 2021. Origin of the Anisotropy and Structure of Ellipsoidal Polyfluorene Nanoparticles [Dissertation]. Konstanz: University of Konstanz

@phdthesis{Sickinger2021Origi-56011, title={Origin of the Anisotropy and Structure of Ellipsoidal Polyfluorene Nanoparticles}, year={2021}, author={Sickinger, Annika}, address={Konstanz}, school={Universität Konstanz} }

Sickinger, Annika 2021-12-22T14:14:54Z 2021-12-22T14:14:54Z terms-of-use Sickinger, Annika 2021 Origin of the Anisotropy and Structure of Ellipsoidal Polyfluorene Nanoparticles eng The properties of polymer nanoparticles, including their shape and size, are known to strongly correlate with polymer chain alignment and the involved mechanisms on a molecular scale. A unique example for this relation is given by the material class of conjugated polymers. Directed via internal chain order, conjugated polymer nanoparticles of non-spherical shape are accessible directly in the process of polymerization. This constitutes a rare exception, as the preparation of such particle shapes is primarily a domain of inorganic materials. Among the broad variety of conjugated polymers, poly(9,9´- dioctylfluorene) exhibits an exceptional polymorphic behavior, which manifests in the coexistence of amorphous, disordered phases along with domains of high order. The evolution of ordered phases in poly(9,9´-dioctylfluorene) is supposed to be related to the unusual ellipsoidal nanoparticle shape. However, the detailed origin of anisotropy and the underlying mechanisms of chain arrangement remained elusive.<br />In this work, the origin of anisotropy in ellipsoidal poly(9,9´-dioctylfluorene) nanoparticles and its correlation with the evolution of ordered phases was elucidated by a combination of preparative approaches and analytical methods. These allowed insight into several decisive factors for the mechanism of anisotropic particle formation. The evolution of chain order in polymers was found to exceptionally correlate with the formation of non-spherical particle shapes.

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