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161. Hugenberg, N.; Loske, S.; Müller, A.H.E.; Schärtl, W.; Schmidt, M.; Simon, P.; Strack, A.; Wolf, B.: Synthesis and large scale fractionation of non-linear polymers: Brushes and hyperbranched polymers, J. Non-Cryst. Solids 307-310, 765 (2002)
Polymer brushes with poly(methyl methacrylate) (PMMA) backbone and polystyrene side chains were synthesized by radical polymerization of small omega, Greek-methacryloyl-polystyrene macromonomers. Hyperbranched PMMA was obtained by means of self-condensing group transfer copolymerization of methyl methacrylate with an initiator-monomer containing a polymerizable methacryloyl moiety and an initiating silylketeneacetal function. Both nonlinear products were fractionated using the method of continuous polymer fractionation, consisting in a particular type of continuous countercurrent extraction. The combination of methyl ethyl ketone (solvent) with acetone (AC) (precipitant) turned out to be suitable for the fractionation of the polymer brushes; in case of the hyperbranched material AC served as the solvent component and methanol as the precipitant. The achieved fractionation was checked by means of GPC measurements and in case of the polymer brushes also by AFM, where the differences in the size of the macromolecules became clearly visible.

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