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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

DELPECH, Marcia C.; COUTINHO, Fernanda M. B.; SOUSA, Kenia G. M.  e  CRUZ, Rosângela C.. Estudo viscosimétrico de prepolímeros uretânicosViscometric study of urethanic prepolymers. Polímeros [online]. 2007, vol.17, n.4, pp.294-298. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282007000400008.

In this study the behavior of urethane prepolymers based on poly(propylene glycol) (PPG) and isophorone diisocyanate (IPDI), in diluted solutions, were studied by viscosimetric measurements, at 30 °C, in two types of solvents with different polarities: isopropyl alcohol and toluene. Five different equations were used to determine intrinsic viscosities values: Huggins; Kraemer and Schulz-Blaschke, by graphic extrapolation; and Solomon-Ciuta; Deb-Chanterjee and; again, Schulz-Blaschke, by a single point determination. The intrinsic viscosities were obtained with two methods (graphic extrapolations and through a single point determination). Viscometric constants from Huggins; Kraemer and Schulz-Blaschke equations were also determined to verify the solvent quality. Regardless of the formulation, isopropyl alcohol was the best solvent for the samples and Solomon-Ciuta equation was the most suitable for the single point determination.

Palavras-chave : Polyurethanes; prepolymers; viscometry.

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