Kinetics of the polymerization of isoprene with isopropoxyneodymium dichloride/triethylaluminium binary lanthanide catalyst system

✍ Scribed by Xiaoping Cai; Zhi Gong; Fosong Wang; Xinghao Zhu

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 359 KB
• Volume: 197
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.1996.021970422

✦ Synopsis

Abstract

The kinetics of the polymerization of isoprene with the heterogeneous rare earth catalyst system isopropoxyneodymium dichloride/triethylaluminium (Nd(OPr^i^)Cl~2~‐AlEt~3~) was examined in a specially designed dilatometer. The rate of polymerization is expressed as R~p~ ≈ −d[M]/d__t__ = k[Nd]^1.40^ [M]. The main kinetical parameters such as the concentration of active propagating chain, the __e__fficiency of __l__anthanide __c__atalyst __u__sed (ELCU), the absolute rate constant of propagation as well as the average life time of growing chains, were determined at 30°C, 40°C, 45°C and 50°C.