A chiral polyfluorene–thiophene derivative incorporating two different chiral side chains was synthesized via the Suzuki coupling reaction. Upon photoexcitation, thin films of the polymer exhibited efficient circularly polarized luminescence in the visible range, even without thermal annealing. The dissymmetry factor, glum, of films with thicknesses less than 100 nm reached 0.2 at 505 nm.
We report an assembly concept of interfacial anchoring, fiber implantation into metal for the reliable joining of polymers on metal substrates via injection molding. Milled glass fibers were implanted into an aluminum surface via simultaneous sand-blasting and laser irradiation. The aluminum substrate was set on a mold, and the melting polymer was injected on top of the aluminum. The molded polymer successfully bonded to the aluminum surface via the mechanical anchoring of milled fibers at the metal/polymer interface. These results demonstrate that this concept can be applied to various polymers and metals to enhance their interfacial characteristics, such as shear strength.
This study demonstrates the supramolecular chirality control of a conjugated polymer via solvent polarity. We designed and synthesized a chiral polyfluorene-thiophene copolymer having two different chiral side chains at the 9-position of the fluorene unit. Chiral cyclic and alkyl ethers with different polarities were selected as the chiral side chains. The sign of the circular dichroism spectra in the visible wavelength region was affected by the solvent system, resulting from the change of supramolecular structure. The estimation of the solubility parameter revealed that the solubility difference of the side chains contributed to the change of the circular dichroism sign, which was also observed in spin-coated films prepared from good solvents having different polarities.
Core–shell graphite particles were successfully prepared via a mechanical mixing process. The thermally conductive and electrically insulating properties were designable for injection mouldable polymer composites.
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