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Title: | An effect of side chain length on the solution structure of poly(9,9-dialkylfluorene)s in toluene | Authors: | Knaapila, M. Almásy, L. Garamus, V. M. Ramos, M. L. Justino, L. L. G. Galbrecht, F. Preis, E. Scherf, U. Burrows, H. D. Monkman, A. P. |
Keywords: | Conjugated polymers; Polyfluorene; Solutions | Issue Date: | 2008 | Citation: | Polymer. 49:8 (2008) 2033-2038 | Abstract: | The effect of side chain length of [pi]-conjugated poly(9,9-dialkylfluorene)s has been studied in semi-dilute (10 mg/mL) toluene solutions using small-angle neutron scattering (SANS) and 1H and 2H NMR spectroscopies. Under these conditions, SANS data indicate that poly(9,9-dinonylfluorene) and poly(9,9-dioctylfluorene) are dissolved down to the molecule level and appear as elongated one-dimensional chains (length >20-30 nm). In contrast, the shorter side chain polymers exhibit a self-association so that poly(9,9-diheptylfluorene) forms thin sheet-like (~1 nm) and poly(9,9-dihexylfluorene) thin (~1 nm) and thick sheet-like (>6 nm) aggregates. 1H NMR data, together with the density functional theory (DFT) calculations, however, show that this occurs without changes in the conformation of the polymer backbone. | URI: | https://hdl.handle.net/10316/5021 | DOI: | 10.1016/j.polymer.2008.02.046 | Rights: | openAccess |
Appears in Collections: | FCTUC Química - Artigos em Revistas Internacionais |
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