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Radical polymerization of dicyclohexyl fumarate and its derivatives as studied by electron spin resonance spectroscopy

✍ Scribed by Akikazu Matsumoto; Yoshinori Sano; Masahiro Yoshioka; Takayuki Otsu

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
698 KB
Volume
32
Category
Article
ISSN
0014-3057

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✦ Synopsis

The radical polymerization of dicyclohexyl fumarate (DCHF) and its derivatives was carried out with dimethyl 2,2'-azobisisobutyrate in benzene at 60°C. The propagation and termination rate constants (kp and kl) were determined by electron spin resonance spectroscopy. The k, and k, values were 0.48-0.91 l/mol set and 14-23,000 l/mol set, depending on the DCHF concentration (0.1-1.5 mol/l). It has been revealed that the alkyl substituents on the cyclohexyl ring have important effects on the polymerization reactivity of the DCHF derivatives. The 2-substituted cyclohexyl derivatives showed a lower polymerization reactivity because. of the decrease in k,. The propagation manner of the 2-substituted derivatives is discussed, based on the results of the investigation of the tacticity of the polymer in comparison with those of non-or 4-substituted derivatives.

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