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Radical Polymerization and Copolymerization of 12‐[( N ‐Methacryloyl)carbamoyloxy]octadecanoic Acid
Author(s) -
Seno Makiko,
Fukui Tomoya,
Sato Tsuneyuki
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010201)202:3<401::aid-macp401>3.0.co;2-2
Subject(s) - polymerization , polymer chemistry , copolymer , chemistry , acrylonitrile , monomer , radical polymerization , styrene , arrhenius equation , solvent , arrhenius plot , methyl methacrylate , photochemistry , polymer , activation energy , organic chemistry
Radical polymerization of 12‐[( N ‐methacryloyl)carbamoyloxy] octadecanoic acid ( 1 ) was kinetically and ESR spectroscopically investigated in acetone, using dimethyl 2,2′‐azobisisobutyrate ( 2 ) as initiator. The polymerization rate ( R p ) is given by R p = k [2] 0.7 [1] 1.4 at 50°C. Propagating poly( 1 ) radical was observed as a 13‐lines spectrum by ESR under the actual polymerization conditions. The ESR‐determined k p values (1.8–7.9 L/mol·s) are much lower than those of usual methacrylate monomers. The rate constant ( k t ) of termination was determined to be k t = 1.0–2.7·10 4 L/mol·s from decay curve of the propagating radical. The Arrhenius plots of k p and k t gave the activation energies of propagation (63 kJ/mol) and termination (24 kJ/mol). A significant solvent effect was observed on the radical polymerization of 1 . The copolymerizations of 1 with styrene(St) and acrylonitrile were examined at 50°C. Copolymerization parameters obtained for the 1 (M 1 )/St (M 2 ) system are as follows; r 1 = 0.73, r 2 = 0.57, Q 1 = 0.83, and e 1 = 0.13.