|164. Böker, A.; Elbs, H.; Hänsel, H.; Knoll, A.; Ludwigs, S.; Zettl, H.; Urban, V.; Abetz, V.; Müller, A.H.E.; Krausch, G.: Macroscopic Alignment of Concentrated Block Copolymer Solutions in Electric Fields, Polym. Prepr. (Am. Chem. Soc., Div. Polym. Chem.) 43(2), 350 (2002)|
We investigate the microscopic mechanisms responsible for microdomain alignment in PS-b-PI block copolymer solns. in toluene exposed to an elec. field. Using time-resolved synchrotron small angle X-ray scattering, we reveal two distinct processes, i.e. grain boundary migration and rotation of entire grains as the two dominant microscopic mechanisms. The former dominates in weakly segregating systems, while the latter is predominant in strongly segregated systems. The kinetics of the processes is followed as a function of polymer concn., temp., field strength and system size.