The Thermal Dimerization and Polymerization of 1,3-Cyclohexadiene
作者:
Tadashi Nakata,
Nobuo Choumei,
期刊:
Journal of Macromolecular Science: Part A - Chemistry
(Taylor Available online 1967)
卷期:
Volume 1,
issue 8
页码: 1433-1446
ISSN:0022-233X
年代: 1967
DOI:10.1080/10601326708053783
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The thermal polymerization of 1,3-cyclohexadiene to produce dimer and low molecular weight polymer is reported. The reaction initiated thermally and/or by benzoyl peroxide is kinetically of the second order, and the activation energy is 13.1 kcal/mole. The activation energy for the reaction is in quantitative agreement with that of the homopolymerization of 1,3-cyclohexadiene estimated from the kinetic study on the copolymerization with acrylonitrile. Evidently the dimerization process to give dimer as a product of typical Diels-Alder condensation is a competing type of reaction with radical polymerization to give a low molecular weight polymer. The ratio of the rate constant for two competing types of reaction at 200°C is found to be 1.21. The thermal polymerization in the presence of oxygen produces dimer in greater yield as a result of inhibition of the radical polymerization process.
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