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Beta-phase formation in a crosslinkable poly(9,9-dihexylfluorene)

Kuehne, A. J. C. and Mackintosh, A. R. and Pethrick, R. A. (2011) Beta-phase formation in a crosslinkable poly(9,9-dihexylfluorene). Polymer, 52 (24). pp. 5538-5542. ISSN 0032-3861

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The synthesis of a crosslinkable poly(9,9-dihexylfluorene) derivative is reported. Vinyl ether moieties allow for photolithographic patterning, resulting in an immiscible polyfluorene network, which enables subsequent wet thin-film processing. The metastable β-phase morphology, inherent to most polyfluorene homopolymers, can be induced in this crosslinkable polymer. This is verified by optical spectroscopy, X-ray diffraction and by thermal analysis. The β-phase in polyfluorenes is of interest due to its superior optical and electrical characteristics compared to the amorphous phase. Here, amplified stimulated emission is studied. Surprisingly, the β-phase polymer exhibits higher emission thresholds than the amorphous analogue.