Methods of narrowing the molecular size distribution in hyperbranched polymerization involving AB(2) and B-2 monomers

摘要

A kinetics model was developed describing the time evolution of the molecular size distribution in hyperbranched condensation polymerization of monomers AB(2) and B-2 (A and B are functional groups). The rate equations derived from the model were used to calculate moments of the distribution of polymer species. The calculation procedure was adjusted to simulate introduction of fresh AB(2) monomer into the polymerization reactor in equal portions, with each portion introduced after the previous one reached a predetermined conversion degree. The core monomer B-2 was introduced with the first portion. The calculation procedure also made it possible to subtract unreacted monomer from the system. This was yet another method of narrowing the molecular size distribution of polymers in addition to the feed scheme.