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Effect of LiClO 4 on radical polymerization of methyl methacrylate
Author(s) -
Seno Makiko,
Matsumura Nobuyuki,
Nakamura Hiroyuki,
Sato Tsuneyuki
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970307)63:10<1361::aid-app16>3.0.co;2-7
Subject(s) - methyl methacrylate , copolymer , polymer chemistry , polymerization , styrene , radical polymerization , solution polymerization , chemistry , polymer , materials science , organic chemistry
The effect of LiClO 4 on the polymerization of methyl methacrylate (MMA) with dimethyl 2,2′‐azobisisobutyrate (MAIB) was investigated at 50°C in methyl ethyl ketone. The polymerization proceeded homogeneously even at [LiClO 4 ] as high as 3.00 mol/L. The polymerization rate ( R p ) and the molecular weight of the resulting polymer profoundly increased with increasing [LiClO 4 ]. R p at 3.00 mol/L [LiClO 4 ] was 12 times that in the absence of LiClO 4 . The rate equation depended on the presence or absence of LiClO 4 : R p = k ′[MAIB] 0.5 [MMA] 1.5 in the presence of 3.00 mol/L [LiClO 4 ] and R p = k [MAIB] 0.5 [MMA] 1.0 in the absence of LiClO 4 . The overall activation energies of polymerization were 38.5 kJ/mol in the presence of 3.00 mol/L [LiClO 4 ] and 77.4 kJ/mol in the absence of LiClO 4 , respectively. The tacticities of resulting poly(MMA) were insensitive to the presence of LiClO 4 . In the copolymerization of MMA and styrene, Q and e values of MMA increased with increasing [LiClO 4 ], leading to enhanced alternating copolymerizability. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 1361–1368, 1997