Rate of Polymerization and Molecular Weight in the Nonstationary-State Slow Initiated Polymerization

Abstract

In the polymerization which is characterized by the increase of polymerization rate and growth of molecular weight with reaction time or conversion, the hypothesis of stationarystate is not realized. In this paper, a kinetical consideration on the basis of nonstationarystate is presented for the polymerization in which the rate of initiation is smaller than that of propagation. The quantitative relation between reaction condition and both molecular weight of polymer and rate of polymerization are proposed. Several typical examples of no termination; polymerization of ethylene and acrylonitrile with initiator, ethylene and vinyl chloride by γ-radiation, ethylene and propylene with complex catalyst were discussed and above theoretical relation is shown to be well applied to those kinetical data.