Modelling free-radical copolymerization kinetics—evaluation of the pseudo-kinetic rate constant method, 2†. Molecular weight calculations for copolymers with long chain branching

摘要: The full moment equations and using pseudo-kinetic rate constants for binary copolymerization with chain transfer to polymer in the context of terminal model have been developed solved numerically a batch reactor operating over wide range conditions. Calculated number- weight-average molecular weights (Mn Mw) were compared those found constant method (PKRCM). results show that calculated PKRCM are agreement moments when polymeric radical fractions φ1˙ φ2˙ type 1 2 (radical centers on monomer types copolymerization) accounting small molecules reactions addition propagation reactions. Errors calculating Mw not always negligible neglecting polymer. In this case, relative error by increases increase conversion, extent copolymer compositional drift rates. errors Mw, however, vanish entire conversion all polymerization conditions properly taken into account. It is theoretically proven valid copolymerizations. One can therefore conclude weight modelling multicomponent polymerizations.