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Copolymerization of methyl methacrylate and allyl acetate Part I. Rate of reaction
Author(s) -
Hendrana Sunit,
Hill David J T,
Senake Perera M C,
Pomery Peter J
Publication year - 2001
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.671
Subject(s) - comonomer , copolymer , methyl methacrylate , monomer , mole fraction , polymer chemistry , chemistry , radical , electron paramagnetic resonance , photochemistry , materials science , nuclear magnetic resonance , organic chemistry , polymer , physics
Free radical bulk copolymerization of methyl methacrylate (MMA) and allyl acetate (AAc) has been investigated using electron spin resonance (ESR) and FT–near infrared (FTNIR) spectroscopy. Data are used to evaluate the rate constants. The mole fraction of AAc plays an important role in the copolymerization of these two monomers. AAc not only delays the Trommsdorff effect but also increases the onset of percentage total conversion at which the Trommsdorff region begins. With AAc fraction 0.5 and higher, no Trommsdorff effect was observed. Inclusion of AAc into copolymer structure mainly occurs in the Trommsdorf region or when the AAc fraction in the comonomer feed is dominant. This is associated with a drop in the concentration of propagating radicals. However, ESR spectra indicate that the MMA propagating radical is predominant during the reaction. In the comonomer mixtures where a Trommsdorff region can be observed, the addition of AAc does not produce any significant change in k p and k t in the steady state region. Major changes in k p and k t are observed after the gel point and glassy state, respectively. © 2001 Society of Chemical Industry