Dynamic light scattering (DLS) measurements were done at an Anton Paar Litesizer 500 in quartz glass cuvettes from Hellma at 25 °C in backscattering mode (175°). One measurement consists of six consecutive runs. Samples were dispersed in THF at a concentration of 2 g L -1 . The unfiltered solutions were used. A cumulant fit was used for fitting the experimental data Synthetic procedures.