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Viscometric study of high-cis polybutadiene in toluene solution

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Author(s): Mello Ivana L. | Delpech Marcia C. | Coutinho Fernanda M. B. | Albino Fernanda F. M.

Journal: Journal of the Brazilian Chemical Society
ISSN 0103-5053

Volume: 17;
Issue: 1;
Start page: 194;
Date: 2006;
Original page

Keywords: polybutadiene | viscosity | molecular weight | single point determination

ABSTRACT
Viscometric measurements, in toluene solution at 30 ÂșC, were performed with high-cis polybutadiene synthesized by neodymium based catalyst. Six different equations were used to calculate intrinsic viscosities and viscosimetric constant values: Huggins, Kraemer, Martin and Schulz-Blaschke by graphic extrapolation, and Solomon-Ciuta, Deb-Chanterjee and again Schulz-Blaschke, through a single point determination. The molecular weight of the polymers was also determined applying Mark-Houwink-Sakurada equation using the values of intrinsic viscosity obtained by the six equations. The values of intrinsic viscosity and viscosity-average molecular weight obtained by the two methods were compared in order to verify the validity of the single point determination for high-cis polybutadiene.
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