Intramolekulární samoorganizované struktury v amfifilních kopolymerech

Košovan, Peter

59 ËÙÑÑ ÖÝ In this thesis we have presented results of our simulation studies concerning the intramolecular morphology of amphiphilic polymers. Amphiphilic polymers are those which contain two or more types of monomer units with different affinity for the solvent. Using the common terminology of polymer physics, we say that such polymers are in the selective solvent, i. e. such that it is poor for one type of units and good for the other type. In our definition of amphiphilic polymers we also include polyelectrolytes in which the good solvent conditions can be induced by the electrostatic repulsion among the charged monomer units. In our studies we have investigated both polyelectrolytes and neutral polymers of linear as well as branched topologies. While the poorly soluble monomer units have the tendency to collapse into compact globular structures, this tendency is counteracted by the excluded vol- ume repulsion among the well-soluble units. Equilibrium is attained when the two tendencies are balanced which often results in the so-called pearl-necklace confor- mation consisting of both collapsed domains (pearls) and stretched ones (strings). This behaviour has been first predicted for linear polyelectrolytes in poor solvents by Dobrynin and coworkers [8]. Later on similar structures have been predicted by...

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