Authors Schmaljohann, D. ; Barratt, J. ; Komber, H. ; Voit, B.
Title Kinetics of non-ideal Hyperbranched Polymerizations, 1. Simulation of the Structural Units and the Diads
Date 01.09.2000
Number 8912
Abstract The kinetics of reactions with nonuniform reaction rate constants leading to hyperbranchedpolymers has been examined and discussed. A matrix notation was developed, which has then been appliedto the analysis of the kinetics of AB<SUB>2</SUB>, AB<SUB>3</SUB>, AB<I><SUB>n</SUB></I><SUB></SUB>, and ABB' systems. All differential equations have beenintegrated numerically in order to obtain plots of the ratios of structural units as functions of theconversion. Three general situations for AB<SUB>2</SUB> systems and the kinetics of self-condensing vinyl polymerization as one example of an ABB' system are discussed. It was found that the influence of the first Bgroup on the reactivity of the second B group has the largest effect on ratio of structural units and finalcomposition. Thus, by varying the rate constants of these reaction steps in the model the resulting degreeof branching ranges between 15 and 89%. Furthermore, the diad formation of the AB<SUB>2</SUB> system is analyzed.
Publisher Macromolecules
Wikidata Q61053782
Citation Macromolecules 33 (2000) 6284-6294
Tags condensing vinyl polymerization molecular-weight distribution radical polymerization conversion dependence step-growth polymers simulation polyesters parameters viscosity

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