@article{knaapila_an_effect_2008, 
author={Knaapila, M. and Almasy, L. and Haramus, V.M. and Ramos, M.L. and Justino, L.L.G. and Scherf, U. and Burrows, H.D. and Monkman, A.P.},
title={An effect of side chain length on the solution structure of poly(9,9-dialkylfluorene)s in toluene},
year={2008},
journal = {Polymer},
volume = {49},
number = {8},
pages = {2033 - 2038},
doi = {http://dx.doi.org/10.1016/j.polymer.2008.02.046},
abstract = {The effect of side chain length of π-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 (not, vert, similar1 nm) and poly(9,9-dihexylfluorene) thin (not, vert, similar1 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.},
note = {Online available at: \url{http://dx.doi.org/10.1016/j.polymer.2008.02.046} (DOI). Knaapila, M.; Almasy, L.; Haramus, V.M.; Ramos, M.L.; Justino, L.L.G.; Scherf, U.; Burrows, H.D.; Monkman, A.P.: An effect of side chain length on the solution structure of poly(9,9-dialkylfluorene)s in toluene. In: Polymer. Vol. 49 (2008) 8, 2033 - 2038. (DOI:  10.1016/j.polymer.2008.02.046)}}