Researches On The Synthesis And Characterization Of 100%DP Hyperbranched Polymer Bearing Multi-functional Sites Core Molecules

In the past decades, highly branched polymers have become an attractive field of research. They have attracted more and more attention and large amounts of hyperbranched polymers have been prepared. Because of their unique architecture,these polymers show attractive properties such as low viscosity and excellent solubility in organic solvents Dendrimers and hyperbranched polymers are two different approaches. Dendrimers are monodisperse, globular, perfectly branched and the terminal groups are located on the surface of the molecule. Dendrimers can be synthesized through convergent or divergent growth. Regardless of which route is chosen the production of dendrimers, however, requires multistep synthesis and troublesome purifications between each step, making it a costly and time-consuming process.On the contrary, Hyperbranched polymer can be easily prepared from monomers of ABx-type in a straightforward one-pot synthesis. Hyperbrached polymers, similar with dendrimers, they possess numerous functional groups, low viscosity, a high segment density. Therefore, they provide a less expensive alternative to dendrimers and become a hot topic in this field.In this paper, a new strategy for synthesis hyperbranched polymer with 100% DB and low polydispersity was designed. Firstly, by following former scientist’s work we designed a AB2-type monomer with isatin as B functional site and aromatic moiety as A functional site. Secondly, a core molecule with six functional site was designed and prepared. Then at the presence of superacid we made the monomer and core molecular reacting together.and a fully branched hyperbrached polymer was prepared. According to the gained data we found that the introduction of the multi-functional site core molecular did reduce the polydispersity, and made hyperbranched polymer closer to dendrimers.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.