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Radical Polymerization of .alpha.-Methylenebenzocyclobutene, A Cyclic Analog of .alpha.-Methylstyrene
- Source :
- Macromolecules. 28:5947-5950
- Publication Year :
- 1995
- Publisher :
- American Chemical Society (ACS), 1995.
-
Abstract
- α-Methylenebenzocyclobutene (MB) was prepared by Wittig reaction of 1-(triphenylphosphonio)benzocyclobutene bromide with paraformaldehyde in 70% yield. Radical polymerization of MB afforded poly(α-methylenebenzocyclobutene) (PMB) in 66% yield (M n = 20 000). MB, which can be regarded as a cyclic analog of α-methylstyrene, had a higher polymerizability than α-methylstyrene. The higher polymerizability of MB was confirmed by semiempirical molecular orbital calculation by comparison with that of α-methyleneindane. Radical copolymerizations of MB with styrene (St), methyl methacrylate (MMA), and maleic anhydride (MANH) gave corresponding copolymers quantitatively. Especially, the copolymerization with MANH afforded the corresponding alternating copolymer. Q and e values of MB were determined as 1.35 and -1.00, respectively, from the results of the copolymerizations with MMA. Thermal properties of the obtained PMB were examined, and the thermal decomposition of PMB was discussed.
Details
- ISSN :
- 15205835 and 00249297
- Volume :
- 28
- Database :
- OpenAIRE
- Journal :
- Macromolecules
- Accession number :
- edsair.doi...........efd7f29b1ae96a27662a23e49b236bbe