A new hyperbranched polyester with a high degree of branching was successfully synthesized by A2 + B3 polymerization of di(ethylene glycol) (A2) and aconitic acid (B3) in a 3:2 molecular ratio. Gelation was effectively avoided by producing in situ an AB2 monomer via this method. The structure and composition of the polyester were characterized using gel permeation chromatography and nuclear magnetic resonance and Fourier transform infrared spectroscopies.
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Cao et al. (2010) studied this question.
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