Transport properties of some cationic polysaccharides

Ghimici, Luminiţa; Nichifor, Marieta

doi:10.1016/j.jcis.2006.06.073

Cited by 19 publications

(18 citation statements)

References 44 publications

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“…This problem can be solved either by addition of low-molar-mass electrolyte or by means of semi-empirical equa- Fuoss and Strauss (1948), Yang (2004), Rushing and Hester (2004), or Wolf (Eckelt, Knopf, & Wolf, 2008). Fedors' equation (Fedors, 1979) modified by Rao (Rao, 1993) and verified for neutral polymer, has been successfully extended to some polyelectrolytes in both water (Ghimici & Popescu, 1998;Ghimici & Nichifor, 2006) and water/organic solvent mixtures (Dragan & Ghimici, 2001;Ghimici & Avram, 2003;Ghimici & Nichifor, 2006). In the case of amphiphilic polymers, the meaning of the intrinsic viscosity can sometimes be doubtful since macromolecules can form aggregate (inter-or/and intramolecular), as we have already shown for these polymers using fluorescence techniques based on fluorescence probe or fluorescently labeled polymers (Nichifor, Lopes, et al, 2004).…”

Section: Intrinsic Viscosities In Dilute Regimementioning

confidence: 99%

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

Nichifor¹,

Stanciu²,

Ghimici³

et al. 2011

Carbohydrate Polymers

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Section: Intrinsic Viscosities In Dilute Regimementioning

confidence: 99%

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

Nichifor¹,

Stanciu²,

Ghimici³

et al. 2011

Carbohydrate Polymers

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“…Semi‐empirical equations could describe the viscosity variation with concentration only for polymers with low degree of substitution. This equation, which was modified by Rao and verified for neutral polymer, has been successfully extended to some PELs in aqueous solution . In the case of amphiphilic polymers, the meaning of the intrinsic viscosity can sometimes be doubtful since macromolecules can form inter‐ or/and intramolecular aggregates .…”

Section: Introductionmentioning

confidence: 99%

Characterization of highly substituted, cationic amphiphilic starch derivatives: Dynamic surface tension and intrinsic viscosity

et al. 2013

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The surface activity and viscometric behavior of highly substituted, amphiphilic polysaccharides, derived from potato starch by modification with benzyl‐ and hydroxypropyl‐trimethylammonium groups, are studied in salt‐free and 0.05 M NaCl aqueous solution. For the first time dynamic surface tension measurements of amphiphilic starch derivatives have been effected using the pendant drop method and it was possible to correlate them with particle sizes and apparent charge density. Rheological investigation of large concentration ranges (0.01–20 g/L) is used to discuss Huggins plots and typical polyelectrolyte (PEL) behavior for all starch derivative samples could be found. The determination of overlap concentration and, in dilute aqueous solution, of intrinsic viscosity was possible. For the latter one the semi‐empirical equation of Rao was used, making it possible to get insights to PEL conformation in dependence on the degrees of substitution (DS) of both substituents. It is shown that for intrinsic viscosity an inversion of the impact of both substituents takes place, with hydrophobic benzyl groups on the one hand and cationic hydroxypropyl‐trimethylammonium groups on the other. Data evaluation via the ratio of both DS values had been successfully utilized and thus, the applied method has been identified as being a promising tool to compare a multitude of starch derivatives with substituents of different polarity in various DS to get tendencies regarding overall hydrophobicity.

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“…The applicability of the Rao equation to describe the viscosity of the polymer solution was also found in the case of other polyelectrolytes [35][36][37].…”

Section: Inset) Showing That the Rao Equation Is Suitable For Descrimentioning

confidence: 94%

Novel biodegradable flocculanting agents based on pullulan

Ghimici¹,

Constantin²,

Fundueanu³

2010

Journal of Hazardous Materials

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Transport properties of some cationic polysaccharides

Cited by 19 publications

References 44 publications

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

Hydrodynamic properties of some cationic amphiphilic polysaccharides in dilute and semi-dilute aqueous solutions

Characterization of highly substituted, cationic amphiphilic starch derivatives: Dynamic surface tension and intrinsic viscosity

Novel biodegradable flocculanting agents based on pullulan

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