Kinetic Analysis of Slow Monomer Addition in Synthesis of Hyperbranched Polymers

摘要

@@1.Introduction Owing to their unique structures and properties, hyperbranched polymers have extensive prospects of application and have drawn more and more attention. Kim et al.[1] first synthesized the hyperbranched polyphenylene by AB2 type monomers. So far, most hyperbranched polymers are prepared by Abg (g>1) type monomers[2] or the self-condensing vinyl polymerization (SCVP) of inimers[3]. However, both theory and experiment show that the molecular weight distribution of the hyperbranched polymers formed from one-pot synthesis is extremely broad at high conversion of monomers and it is difficult to control the molecular weight. The introduction of multifunctional core molecules in the hyperbranched polymerization process narrows polydispersities of the resulting hyperbranched polymerS[4]. Moreover, the polydispersity of polymers obtained can drastically decrease when monomers were slowly added to the reaction system[5]. In this work, we analysis the kinetic process and derive the expressions of distribution function and the various molecular parameters for the slow monomer addition polymerization process, with the conversion of monomers as variable.