Year 2007, Month 6 (Section Full Articles, Page 1162)
Uncontrolled pseudoliving freeradical polymerization of methyl methacrylate in the presence of butyl-p-benzoquinones
V. A. Dodonov, Yu. L. Kuznetsova, A. I. Vilkova, A. S. Skuchilina, V. I. Nevodchikov, and L. N. Beloded
Polymerization of methyl methacrylate initiated by dicyclohexyl peroxydicarbonate in the presence of tri-n-butylboron and butyl-p-benzoquinone or 2,5-di-tert-butyl-p-benzoquinone occurred with no induction period. The yields and molecular masses of the polymers linearly increased with an increase in the conversion degree, which suggests the freeradical mechanism of "living" chain polymerization. The poly(methyl methacrylate) macrochains of the prepolymers contained sterically hindered aromatic structures with labile C—O bonds. The latter underwent reversible homolytic dissociation to give a growthinducing radical and sterically hindered aryloxyls. Pseudoliving freeradical polymerization in the presence of the prepolymer (macroinitiator) was studied at 45, 60, and 80 °C.
BACK I wish to order PDF file of this article for 25.00 USD
|