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- W2028932076 abstract "The substituent effect on the radical polymerization of o-quinodimethanes, generated by thermal isomerization of benzocyclobutenes, was investigated. Polymerizations of three benzocyclobutenes bearing electron-withdrawing groups were studied, namely 1-cyanobenzocyclobutene (1), 1-chlorobenzocyclobutene (2), and 1-bromobenzocyclobutene (3). While radical polymerizations of 2 and 3 did not afford any polymer, radical polymerization of 1 afforded n-hexane-insoluble polymer(Mn = 5000) in moderate yields at temperatures above 120°C. The structure of the obtained polymer was confirmed to be a ring-opened polymer(4) by IR, 1H-, and 13C-NMR. The yield of the polymer increased with an increase in the initiator concentration. The polymer yield reported in this paper is higher than those of benzocyclobutenes bearing electron-donating groups, reported previously by the authors. The semi-empirical molecular orbital calculation supported the contribution of ring-opening polymerization of spiro-compounds, rejecting the possibility of 1,4-polymerization. Lastly, radical copolymerizations of 1 with various comonomers were also performed to obtain the corresponding copolymers. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 1555–1563, 1999" @default.
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- W2028932076 date "1999-05-15" @default.
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- W2028932076 title "Polymerization ofo-quinodimethanes. III. Polymerization ofo-quinodimethanes bearing electron-withdrawing groups formedin situby thermal ring-opening isomerization of corresponding benzocyclobutenes" @default.
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- W2028932076 doi "https://doi.org/10.1002/(sici)1099-0518(19990515)37:10<1555::aid-pola17>3.0.co;2-o" @default.
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