Preparation of hyperbranched polyesters from benzene-1,2,4-tricarboxylic-1,2-anhydride and dihydroxy alcohols

摘要

Dendritic polymers, dendrimers and hyperbranched polymers, are of great interest for application in a variety of medical and industrial fields including drug and gene delivery and additives of coating. Dendrimers are synthesized via convergent and divergent approaches. Four approaches are general adopted to synthesize hyperbranched polymers: i) polycondensation of AB_n type monomers; ii) self-condensing vinyl polymerization of AB~* type monomers; iii) polycondensation of A_2 and B_3 type monomers; and iv) ring-opening polymerization of latent AB_n type monomers. Recently, a novel strategy to hyperbranched polymers, one-step reaction of two or more sorts of monomers based on the principle of non-equal reactivity of functional groups, has been presented and developed by our group. Through this strategy, a series of hyperbranched polymers with new structures can be easily prepared. Moreover, a lot of commercially available chemicals are used as the raw monomers, which hopefully extends the availability of hyperbranched polymers with various end groups, architectures and properties.