Toward Thermally, Oxidatively, and Spectrally Stable Polyfluorene-Based Materials: Aromatic Ether-Functionalized Polyfluorene
journal contributionposted on 2009-02-10, 00:00 authored by Shaune L. McFarlane, Davin G. Piercey, Leah S. Coumont, Ryan T. Tucker, Michael D. Fleischauer, Michael J. Brett, Jonathan G. C. Veinot
Two unique fluorene monomers (PTE and MTE) and polyfluorene-based homopolymers (PPTE and PMTE) containing covalently linked aromatic ether (AE) moieties were synthesized via microwave Ni(0)-mediated Yamamoto coupling reactions. The monomers and polymers demonstrated thermal stabilities, as determined by TGA, much higher than status quo poly(9,9′-dioctylfluorene) (PFO) (i.e., greater than 100 °C), and most importantly, the spectral emission remained stable after annealing in ambient and inert atmospheres. PPTE and PMTE were annealed in an N2 atmosphere at 200 °C for 72 h and at 150 °C in ambient atmosphere for 1 h showing no evidence of green emission, in stark contrast to PFO. The results show that PFs with AE moieties present in the 9-position exhibit stable blue emission.