The Synthesis Of Hyperbranched Polymer With Core Based On Superelectrophilic Reaction

At present, there are two main kinds of highly branched polymers:dendrimer and hyperbranched polymer. The synthesis of hyperbranched polymers only needs one-step, which makes them easier to be prepared, but their structures are not regularity. The dendrimers have high branched degree and precise chemical structure, but the synthesis of the dendrimer is hard. Therefore, it is a great challenge for scientists to develope a novel hyperbranched polymer with dendrimer-like structure.To make the target be true, we designed a hyperbranched polymer which has a nucleus and dendrimer-like:First, it has a high branched degree. Second, it has a narrow Mn distribution. At last, it has a precise chemical structure. So the molecule has the virtues of the dendrimer. As I know, the reaction of aromatic compounds and isatin can form a fully branched polymer. The dissertation used isatin and aromatic compounds to synthesize a new fully branched hyperbranched polymer by superelectrophilic reaction. At the begining, we designed and prepared a AB2monomer with isatin as B2function group and aromatic moiety as A function group. Then, the fully hyperbranched polymer was successfully obtained by polymerization of the monomer in the triflic acid. Based on the above result, we added a nucleus of6functioning, because the terminal group of the fully branched molecule distribute in the outside, we got a molecule with a dendrimer-like structure, and deduced the Mn distribution.During our experiment we employed TLC to track the monomer’s sythesis procedure and NMR MS FT-IR to identify the monomers.The resulting polymer was characterized by NMR GPC and the primary data was positive.