2013
DOI: 10.4322/polimeros.2013.064
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Estudo Viscosimétrico de Copolímeros à Base de 1,3-Butadieno e 1-Octeno em Tulueno e Hexano

Abstract: Resumo: A viscosimetria é um procedimento experimental simples e pouco oneroso, que pode fornecer informações valiosas sobre o volume hidrodinâmico e a conformação de macromoléculas em solução, num determinado solvente, em uma dada temperatura. Os parâmetros viscosimétricos podem ser matematicamente calculados por extrapolação gráfica, cuja execução experimental é mais demorada. Em contrapartida, é possível que a determinação seja feita por um único ponto. Foi realizado um estudo viscosimétrico, em solução, de… Show more

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Cited by 4 publications
(7 citation statements)
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“…where Á r = relative viscosity or viscosity ratio (Á r = t/t o , being t o the efflux time of the solvent and t the efflux time of the solution in a given concentration), Á r − 1 = Á sp (Á sp = specific viscosity), Á sp /c = Á red = reduced viscosity or viscosity number, c = concentration, [Á] h = lim c → 0 Á sp /c = intrinsic viscosity or limiting viscosity number of Huggins, [Á] k = lim c → 0 ln Ár /c = intrinsic viscosity or limiting viscosity number of Kraemer, [Á] SB = limÁ sp → 0 Á sp /c = intrinsic viscosity or limiting viscosity number of Schulz-Blaschke, and k h , k k and k SB = coefficients of Huggins, Kraemer and Shulz-Blaschke, respectively. Experimental results show that k h < 0.50 and k k < 0 indicate good solvents, while k h > 0.50 and k k > 0 indicate poor solvents (Delpech et al, 2007(Delpech et al, , 2002a(Delpech et al, , 2002bDelpech & Oliveira, 2005;Mello et al, 2006Mello et al, , 2005Silva et al, 2013).…”
Section: Introductionmentioning
confidence: 94%
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“…where Á r = relative viscosity or viscosity ratio (Á r = t/t o , being t o the efflux time of the solvent and t the efflux time of the solution in a given concentration), Á r − 1 = Á sp (Á sp = specific viscosity), Á sp /c = Á red = reduced viscosity or viscosity number, c = concentration, [Á] h = lim c → 0 Á sp /c = intrinsic viscosity or limiting viscosity number of Huggins, [Á] k = lim c → 0 ln Ár /c = intrinsic viscosity or limiting viscosity number of Kraemer, [Á] SB = limÁ sp → 0 Á sp /c = intrinsic viscosity or limiting viscosity number of Schulz-Blaschke, and k h , k k and k SB = coefficients of Huggins, Kraemer and Shulz-Blaschke, respectively. Experimental results show that k h < 0.50 and k k < 0 indicate good solvents, while k h > 0.50 and k k > 0 indicate poor solvents (Delpech et al, 2007(Delpech et al, , 2002a(Delpech et al, , 2002bDelpech & Oliveira, 2005;Mello et al, 2006Mello et al, , 2005Silva et al, 2013).…”
Section: Introductionmentioning
confidence: 94%
“…Physical-chemical studies of the solvent quality and determination of the best equation to calculate the intrinsic viscosity and molar mass from a single point have been described for various polymer-solvent-temperature systems (Delpech et al, 2007(Delpech et al, , 2002a2002b;Delpech & Oliveira, 2005;Mello et al, 2006Mello et al, , 2005Silva et al, 2013). To the best of our knowledge, there are no reports in the literature of this type of study of polymers based on chitosan.…”
Section: Introductionmentioning
confidence: 96%
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