Multicenter Polyester Initiators for the Preparation of Graft Copolymers with Oligo(2-Oxazoline) Side Chains

摘要

Multicenter polyester initiators intended for the cationic polymerization of oxazolines were synthesized via high-temperature polycondensation of 2-(4-(2-bromoethyl)phenyl sulfonyl hydroquinone with a number of aromatic and alkylene-aromatic dichloroanhydrides. The Kuhn segment values, liquid-crystalline properties, and molecular-mass characteristics of the macroinitia-tors are determined. The synthesized macroinitiators were used in cationic ring-opening polymerization to obtain hybrid comb polymers containing poly(2-oxazoline) side chains. It was suggested the method for estimating the length of poly(oxazoline) side fragments and graft density. It was demonstrated that at a certain ratio between backbone length and side chain length (which depends on chemical structure of the initiator), comb copolymers The graft copolymers form aqueous micellar solutions with a narrow particle-size distribution. They possess a lower critical solution temperature.