Polymerization of 1,3-Butadiene usingAluminoxane-Based Nd-CarboxylateCatalysts

✍ Scribed by Wilson, David J.

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 571 KB
• Volume: 39
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199603)39:3<235::aid-pi490>3.0.co;2-f

✦ Synopsis

The ternary neodymium-based catalyst for the polymerization of 1,3butadiene, Nd(versatate),/AliBu,H/tert-butyl chloride, has been examined with respect to the effects of replacing the alkylaluminium hydride with aluminoxane, namely methylaluminoxane (MAO) and tetraisobutyldialuminoxane (TIBAO). Catalysts based on M A 0 were found to be active even in the absence of a halogen source, whereas TIBAO catalysts were active only when a halogen was present (catalyst activity TIBAO > MAO). Using catalysts prepared both preformed and in situ, the effects of polymerization temperature, solvent and M A 0 level on catalyst activity and the characteristics of the final polymer are discussed. Polybutadiene cis contents and molecular weights were higher with MAO-based catalysts than with AliBu,H-based catalysts. Cis contents were also higher when M A 0 catalysts containing tert-butyl chloride were used, compared to their non-chloride counterparts.