Premium
Consideration of Macromonomer Reactions in n ‐Butyl Acrylate Free Radical Polymerization
Author(s) -
Wang Wei,
Nikitin Anatoly N.,
Hutchinson Robin A.
Publication year - 2009
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200900445
Subject(s) - macromonomer , polymer chemistry , acrylate , monomer , polymerization , radical polymerization , materials science , intermolecular force , solution polymerization , molar mass distribution , polymer , butyl acrylate , chemistry , polymer science , organic chemistry , composite material , molecule
n ‐Butyl acrylate (BA) starved‐feed solution semibatch experiments with varying final polymer content and monomer feed times were carried out at 138 °C. A full mechanistic model of the system implemented in Predici includes intermolecular chain transfer to polymer and macromonomer propagation as well as backbiting, chain scission, and midchain radical propagation and termination. The importance of macromonomer propagation under these conditions of industrial interest is illustrated by experiment and simulation, with the macromonomer reaction responsible for the significant increase in polymer weight‐average molecular weight ( $\overline M _{\rm w}$ ) with time. Rate coefficients for macromonomer propagation ( k mac ) and β ‐scission ( k β ) of k mac / k p = 0.55 and k β = 12 s −1 (with k p the rate coefficient for BA chain‐end propagation) provide a good representation of experimental $\overline M _{\rm w}$ and macromonomer end group data at 138 °C.