Dendritic macromolecules such as dendrimers and hyperbranched polymers (HBPs) are important and relatively new class of macromolecules. As a subset of dendritic polymers, hyperbranched polymers have several important advantages such as better solubility relative to their linear counterparts, and easier syntheses than their analogous dendrimers, which invariably involve tedious, multistep synthetic schemes. Therefore, larger quantities of hyperbranched polymers can be easily produced from ABx(x≥2) monomers to facilitate wider evaluation of the materials for their potential applications and commercialization.

As part of our research program to explore and develop nich applications for aromatic hyperbranched polymers, we describe here the results on

  1. the synthesis of a new AB2 monomer containing a preformed aromatic imide moiety and para-carbonyl functions to facilitate the formation of phenolate nucleophiles using low-cost potassium carbonate
  2. functionalization of the resulting hyperbranched poly(ether-ketone-imide) with reactive chain ends
  3. a preliminary thermal study of the allyl ether-terminated hyperbranched polymer derivative.

The latter effort is to set the stage for further evaluation of such reactive hyperbranched polymer derivatives for uses as toughening additives for high-performance thermosets.


Research topic

  • Synthesis of Dendritic Polymers (Hyperbranched Polymers and Dendrimers)
  • High Performance Polymer Synthesis [Polyimides (PIs), Polyphenylquinoxalines (PPQs), Polybenzoxazoles (PBOs), Polybenzothiazoles (PBZTs),Polybenzimidazoles (PBIs), etc]

Further reading

Carboxylic Acid-Terminated Hyperbranched Polybenzoxazole (PBO) and Its Star Block Copolymers
Lim, J.-K.; Jeon, I.-Y.; Laufersweiler, M.; Lyons, C. B.; Tan, L.-S.; Baek, J.-B. Macromolecules 42, 1541-1553 (2009)
Self-Controlled Synthesis of Hyperbranched Poly(ether-ketone)s from A2+B3 Approach in Poly(phosphoric acid)
Jeon, I.-Y.; Tan, L.-S.; Baek, J.-B. J. Polym. Sci., Part A: Polym. Chem. 47, 3326-3336 (2009)