Effect of pressure on the radiation-induced polymerization of ethylene in tert-butyl alcohol

✍ Scribed by Wada, Takeshi ;Watanabe, Terutaka ;Takehisa, Masaaki

• Publisher: Wiley (John Wiley & Sons)
• Year: 1972
• Tongue: English
• Weight: 474 KB
• Volume: 10
• Category: Article
• ISSN: 0449-296X
• DOI: 10.1002/pol.1972.150100911

✦ Synopsis

Abstract

The effects of pressure of the radiation‐induced polymerization of ethylene in tert‐butyl alcohol were studied. The reaction was carried out by use of a reactor with a capacity of 100 ml under the following conditions; pressure, 60–400 kg/cm^2^; temperature, 24 ± 3°C; dose rate, 2.0 × 10^4^−1.6 × 10^5^ rad/hr; amount of medium (tert‐butyl alcohol containing 5 vol‐% water), 70 ml. The results of polymerization were analyzed by a kinetical treatment based on a reaction mechanism with both first‐ and second‐order terminations for the concentration of propagating, radical. On the basis of the kinetical treatment the rate constants of each elementary reaction at several pressures were determined, and the activation volumes of elementary reactions were obtained and are discussed in connection with the reaction mechanism. Consequently, the rate constants of propagation, first‐order termination, and second‐order termination at pressure p and at 24°C were expressed by,