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Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant ChainGrafting and Cloud Point Modulation by Backbone and Side Chain Length Variation
Thermoresponsive Poly(2-oxazoline) Molecular Brushes by Living Ionic Polymerization: Kinetic Investigations of Pendant ChainGrafting and Cloud Point Modulation by Backbone and Side Chain Length Variation
Molecular brushes of poly(2-oxazoline)s were prepared by living anionic polymerization of
2-iso-propenyl-2-oxazoline to form the backbone and subsequent living cationic ring-opening
polymerization of 2- n - or 2- iso -propyl-2-oxazoline for pendant chain grafting. In situ kinetic
studies indicate that the initiation effi ciency and polymerization rates are independent from the
number of initiator functions per initiator molecule. This was
attributed to the high effi ciency of oxazolinium salt and the
stretched conformation of the backbone, which is caused by
the electrostatic repulsion of the oxazolinium moieties along
the macroinitiator. The resulting molecular brushes showed
thermoresponsive properties, that is, having a defi ned cloud
point (CP). The dependence of the CP as a function of backbone
and side chain length as well as concentration was studied.
