Abstract
The conformation of cylindrical brush polymers with a polymethacrylate main and polystyrene side chains (6 ≤ ≤ 33, with the number-average degree of polymerization of the side chains) were studied by combined light and small-angle neutron scattering experiments. The results reveal that the main chain stiffness expressed in terms of the Kuhn statistical segment length, lk, increases with side chain length but does not follow scaling predictions which most probably is due to the limited length of the side chains investigated experimentally. In this respect the present work addresses the transition regime from flexible coils to stiff cylindrical brushes as a function of side chain length. In detail, the increase of lk is stronger in toluene, a very good solvent for the side chains, than in the poor solvent cyclohexane and does not level off for the longest side chains investigated ( = 33). In contrast to earlier work, the cylinder length per main chain monomer is found to be independent of side chain length ...
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