Copolymerization of 1-hexene and 1-dodecene with 1,3-butadiene by a versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system
Silva, Gustavo M.; Ferreira, Ivana L. M.; Costa, Marcia P. M.; Pires, Neusa M. T.; Costa, Marcos A. S.
http://dx.doi.org/10.4322/polimeros.2014.040
Polímeros: Ciência e Tecnologia, vol.24, n2, p.153-161, 2014
Abstract
The aim of this study was to incorporate an alpha-olefin (1-hexene or 1-dodecene) in a high cis polybutadiene chain, using a neodymium versatate/diisobutylaluminum hydride/t-butyl chloride catalyst system. The influence of alpha-olefin on polymerization reaction and polymer characteristics, using different weight ratios of butadiene/α- olefin, was evaluated. The copolymers were characterized by SEC, FTIR, NMR, TGA and viscosimetric analysis. The thermal stability of the polymer tended to increase with incorporation of alpha-olefins, while its microstructure was not affected. The weight average molecular mass (Mw) tended to increase and the polymerization conversion tended to decrease with increasing alpha-olefins content. The copolymers showed a lower intrinsic viscosity than for the homopolymer. The results indicated that the alpha-olefins were incorporated in the polybutadiene chain.
Keywords
Copolymerization, 1,3-butadiene, alpha-olefin, Ziegler-Natta catalyst, neodymium
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