Sickinger, Annika; Mecking, Stefan published their research in Macromolecules (Washington, DC, United States) in 2021. The article was titled 《Origin of the Anisotropy and Structure of Ellipsoidal Poly(fluorene) Nanoparticles》.Quality Control of Tris(4-bromophenyl)amine The article contains the following contents:
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 exptl. 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 mol. weights are reached very rapidly in the aforementioned polymerizations, despite their step-growth character. Introduction of crosslinks 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). The experimental process involved the reaction of Tris(4-bromophenyl)amine(cas: 4316-58-9Quality Control of Tris(4-bromophenyl)amine)
In other references, Tris(4-bromophenyl)amine(cas: 4316-58-9) is often used in the synthesis of porous luminescent covalent–organic polymers (COPs)Quality Control of Tris(4-bromophenyl)amine
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary