The so-termed hyperbranched polymers differ from classical polymers by their high degree of branching

high density of terminal functionality

and three-dimensional molecular structure. The divergent synthesis of a series of polydisperse hyperbranched poly(amine-ester)s based upon 1

1

1 -trimethylolpropane (as a core molecule) and N

N-diethylol-3-amine methylpropionate (as an AB2 monomer) synthesized via Michael addition of methyl acrylate and diethanolamine is described

proceeding in a stepwise growth manner starting from an "initiator core"building branched arms

i.e.

pseudo-one-step manner

or a one-step procedure in the melt sing P-TSA as catalyst.These materials have different numbers of hydroxyl groups at the chain extremities on each molecule.The moleculat composition of hyperbranched poly(amine-ester)s prepared using the pseudo-one -step procedure have narrower molecular weight distrbutions than the products obtained by using one-spot procedure as detected by GPC.The rheological behavior of the hyperbranched poly(amine-ester)s was investigated using a spinning viscometer. The viscosity is reduced sharply as the temperature increases.The thermal property has been also estimated.The hyperbranched poly(amine-ester)s

synthesized in this study

may be modified to meet particular application requirements for coating

lamination

and adhesive systems.