Hyperbranched polymers 10 years after

Abstract

Dr. Young H. Kim obtained a BS and MS at Yonsei University, Korea, then a Ph.D. at The Weizmann Institute of Science, Israel, with Dr. E. Gil-Av in the subject of chiral recognition. After postdoctoral work with Prof. D. Cram at UCLA working on the stereoselective synthesis and cavitands, he moved to the DuPont CR&D in 1984. Since then, he has started to get involved in polymer research, and has been working on hyperbranched dendritic polymers, aromatic polyamides, and chemical modification of polymers, polyurethane chemistry.ABSTRACT: It has been about 10 years since the first intentional preparation of hyperbranched polymer was disclosed. Hyperbranched polymers, as well as dendrimers, may find utilities in the areas where the structural uniqueness of these polymers gives merit. There has been much progress in the structural understanding and the methods of synthesis of these polymers. However, functional understanding and utility of these polymers are still in infancy. Better understanding on physical properties of these polymers, such as solubility and miscibility of these polymers in solvents or with polymers, and functional group dependency to the thermal relaxation process are needed for further development of the subject.

New methodologies in the construction of dendritic materials

“…Examples of hyperbranched polymers: Boltorn s (P(bis-MPA) hyperbranched polymer), 12 Hybranet (poly(ester amide)), 12 poly(phenylenes), 13 etc.…”

A comparative study of the structure–property behavior of highly branched segmented poly(urethane urea) copolymers and their linear analogs

“…Another approach is the copolymerization of A 2 and B 3 monomers, which is often more attractive due to commercial availability of many A 2 and B 3 monomers. Since their initial discovery, the synthesis of hyperbranched counterparts of almost all common linear polymers has been reported [1][2][3][4]. DSM Corporation of The Netherlands recently reported [5] perhaps the first commercialization of hyperbranched polymers, the Hybrane w polyesteramides.…”

Synthesis and Properties of Hyperbranched Polyurethane with a Long Chain Between the Branching Points

“…Monodisperse, well-defined and perfectly branched dendrimers are prepared by a stepwise growth procedure, but the stepwise nature of their synthesis makes large-scale production difficult since the growth of a single generation requires several reactions and purification steps [3,4]. Although hyperbranched polymers, as the analogue of the dendrimer, have some deficit in structure, they can be easily prepared by one-step polycondensation of the AB x -type (x 2) monomers with a little or no purification.…”