Author/Authors :
Knaapila، نويسنده , , M. and Almلsy، نويسنده , , L. and Garamus، نويسنده , , V.M. and Ramos، نويسنده , , M.L. and Justino، نويسنده , , L.L.G. and Galbrecht، نويسنده , , F. and Preis، نويسنده , , E. and Scherf، نويسنده , , U. and Burrows، نويسنده , , H.D. and Monkman، نويسنده , , A.P.، نويسنده ,
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 (∼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.
