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|Type:||Artigo de periódico|
|Title:||Rheological Properties of Citrus Pectin Dispersions and Its Blends with Polyquaternium-7 and Colloidal Particles|
|Abstract:||This article reports on the rheological behavior of a 5% (w/w) citrus pectin (CP) dispersion, its blends with polyquaternium-7 (PQ) and also with 200 nm nanoparticles (NP) and 1.8 mu m microparticles (MP) of CP. The viscous (G) and elastic (G) moduli of the CP dispersion were similar, whereas G was higher than G for PQ. The 1:20 (w/w) blend of CP and PQ enhanced the viscoelastic profile of CP and also decreased its cross-over frequency. NP and MP were equally effective in enhancing the viscoelastic properties of CP. The best viscoelastic behavior was obtained with 1:20:0.4 (w/w) CP:PQ:(NP or MP) composition. The association of CP with PQ and/or MP or NP tended to change the behavior of CP and PQ dispersions from pseudoplastic to Newtonian. Cox-Merz superposition was observed for CP:PQ and CP:(MP or NP). These findings contribute for modulation of the rheological properties of CP dispersions for specific applications. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40583.|
viscosity and viscoelasticity
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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