Journal of the Brazilian Chemical Society
On-line version ISSN 1678-4790
MELLO, Ivana L.; DELPECH, Marcia C.; COUTINHO, Fernanda M. B. and ALBINO, Fernanda F. M.. Viscometric study of high-cis polybutadiene in toluene solution. J. Braz. Chem. Soc. [online]. 2006, vol.17, n.1, pp. 194-199. ISSN 1678-4790. http://dx.doi.org/10.1590/S0103-50532006000100028.
Viscometric measurements, in toluene solution at 30 ºC, 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.
Keywords : polybutadiene; viscosity; molecular weight; single point determination.