title: Solvent dependent assembly of a polyfluorene-polythiophene "rod-rod" block copolyelectrolyte: influence on photophysical properties.
abstract: We report the solvent-driven assembly of a polyelectrolytic polyfluorene-polythiophene diblock copolymer-poly[9,9-bis(2-ethylhexyl)fluorene]-b-poly[3-(6-trimethylammoniumhexyl)thiophene] (PF2/6-b-P3TMAHT)-in tetrahydrofuran (THF), water, their 1:1 mixture and in subsequently prepared thin films, as investigated using a combination of scattering, microscopic and photoluminescence techniques. In solution PF2/6-b-P3TMAHT forms large (>100 nm) aggregates which undergo a transition from objects with surface fractal interface (THF) to ones with a significant planar component due to the presence of the 2-dimensionally merged ribbon-like aggregates or fused walls of the observed vesicular aggregates [THF-water (1:1)]. In THF-water and water the blocks are loosely segregated into P3TMAHT and PF2/6 rich domains, with PF2/6 dominating the aggregate interior. Depending on solvent, the spun films contain either aggregates with a crystalline interior (THF) or large 200 nm-2 microm vesicular aggregates embedded in a featureless matrix (THF-water and water). Structural variations are concomitant with distinctive solvatochromic changes in the photophysical properties including a color change from deep red (THF) to pale orange (THF-water and water) in solution, a decrease in fluorescence quantum yield with increasing water content, and a shift from photoluminescence of individual PF2/6 blocks (THF) to efficient PF2/6 --> P3TMAHT energy transfer (THF-water and water).
authors.affiliation: Department of Physics, Institute for Energy Technology, NO-2027 Kjeller, Norway. matti.knaapila@ife.no
authors.forename: M
authors.initials: M
authors.lastname: Knaapila
authors.forename: R C
authors.initials: RC
authors.lastname: Evans
authors.forename: A
authors.initials: A
authors.lastname: Gutacker
authors.forename: V M
authors.initials: VM
authors.lastname: Garamus
authors.forename: M
authors.initials: M
authors.lastname: Torkkeli
authors.forename: S
authors.initials: S
authors.lastname: Adamczyk
authors.forename: M
authors.initials: M
authors.lastname: Forster
authors.forename: U
authors.initials: U
authors.lastname: Scherf
authors.forename: H D
authors.initials: HD
authors.lastname: Burrows