Origin of the Anisotropy and Structure of Ellipsoidal Poly(fluorene) Nanoparticles

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Macromolecules. American Chemical Society (ACS). 2021, 54(11), pp. 5267-5277. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/acs.macromol.1c00597
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Polymer nanoparticles with a nonspherical shape are difficult to access and rare. Heterophase Suzuki–Miyaura polycondensation can yield distinct ellipsoidal poly(9,9′-dioctylfluorene) nanoparticles. We reveal the origin of this unusual particle shape by a combination of experimental approaches. Given sufficient chain mobility, enabled by the choice of a suitable organic solvent, also prefabricated oligomers with a DPn ≥ ca. 10 and polymers can form ellipsoidal nanoparticles. This agrees with the finding that high molecular weights are reached very rapidly in the aforementioned polymerizations, despite their step-growth character. Introduction of cross-links during the polymerization disturbs the evolution of nonspherical particles. Overall, the formation of anisotropic particle shapes (as observed by TEM) strongly correlates with the formation of β-phase regimes with an ordered polymer packing in the particles (as observed by UV/Vis absorption and fluorescence spectroscopy).

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ISO 690SICKINGER, Annika, Stefan MECKING, 2021. Origin of the Anisotropy and Structure of Ellipsoidal Poly(fluorene) Nanoparticles. In: Macromolecules. American Chemical Society (ACS). 2021, 54(11), pp. 5267-5277. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/acs.macromol.1c00597
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@article{Sickinger2021Origi-54103,
  year={2021},
  doi={10.1021/acs.macromol.1c00597},
  title={Origin of the Anisotropy and Structure of Ellipsoidal Poly(fluorene) Nanoparticles},
  number={11},
  volume={54},
  issn={0024-9297},
  journal={Macromolecules},
  pages={5267--5277},
  author={Sickinger, Annika and Mecking, Stefan}
}
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