DENSE STAR POLYMERS: A NOVEL STRUCTURAL CLASS OF POLYMERS

摘要

A novel class of branched polymers containing dendritic branches having functional groups uniformly distributed on the periphery of such branches and more particularly to a dense star polymer having at least one core branch emanating from a core, each core branch having at least one terminal group provided that (1) the ratio of terminal groups to the core branches is greater than 1:1, (2) the density of terminal groups per unit volume in the polymer is at least 1.5 times that of a conventional star polymer having similar core and monomeric moieties and a comparable molecular weight and number of core branches, each of such branches of the conventional star polymer bearing only one terminal group, and (3) a molecular volume that is no more than 60 percent of the molecular volume of said conventional star polymer, the polymer exhibiting increased concentrations of functional groups per unit volume of the polymer macromolecule which is more spheroidal and compact than conventional star branched polymers.