Kinetics of natural rubber vulcanization in the end stage of curing period

✍ Scribed by Ping-Yue Wang; Hong-Lian Qinn; He-Ping Yu

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 68 KB
• Volume: 101
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.23554

✦ Synopsis

Abstract

It was found that the change of vulcameter torque in the end stage of curing period of natural rubber does not follow first‐order kinetics and can be expressed in a kinetic equation of . The reaction order n calculated by the above equation is in the range of 0.68–0.74. The rate constant of the end stage increases with a rise in temperature and is well satisfied with Arrherius equation, giving activation energy E = 79.321 kJ/mol. If whole curing period is treated by first‐order kinetics without a change of reaction order from n = 1 to n = 0.68–0.74, the values of torque in the end stage of curing period predicted with first‐order kinetics equation will be lower than that obtained from vulcameter. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 580–583, 2006