Abstract
The molecular weight of hyperbranched polyesters, prepared by condensation polymerization of the AB2 monomer dimethyl 5-(2-hydroxyethoxy)isophthalate in the presence of either a B3 core (trimethyl 1,3,5-benzenetricarboxylate) or a B2 core (dimethyl isophthalate), was controlled by varying the core-to-monomer ratio. During polymerization polycondensation, cyclization and core-termination reactions occurred in competition. The polyester's weight-average molecular weight continued to increase even after complete consumption of the A groups by cyclization and core termination, which is postulated to result from a redistribution of polymer chains by ester−ester interchange reactions. The polymers are soluble in common organic solvents, and solutions have characteristically low intrinsic viscosities. The physical characterization of these polymers is reported.
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