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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.
DOI: 10.1016/j.polymer.2008.02.046
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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