| 초록 |
Hyperbranched polymers have gained much attention due to the availability of these materials by one-pot synthesis and their interesting properties such as low viscosity and good solubility. Among several types of hyperbranched polymers, hyperbranched aliphatic polyesters with hydroxyl terminal groups were studied intensively due to their biocompatible and biodegradable properties. In this study, we synthesized hyperbranched aliphatic polyester from bis-MPA (2,2-bis(hydroxymethyl)propioic acid) as a AB2 monomer by using Hafnium(Ⅳ) salts. Compared with other acid catalyst (ex. p-TSA, H2SO4), Hafnium (Ⅳ)-salts did not catalyze the transesterification and etherification at all. Since this catalyst did not cause any side reactions, it was possible to synthesize high molecular weight hyperbranched aliphatic poly(bis-MPA) without gelation. |
