Interaction of (hydroxypropyl) cellulose with anionic surfactants in dilute regime

Martins, Ricardo Martins de; Silva, Carolina A. da; Becker, Cristiane Miotto; Samios, Dimitrios; Christoff, Marcelo; Bica, Clara Isméria Damiani

doi:10.1007/s00396-006-1497-4

Cited by 25 publications

(34 citation statements)

References 51 publications

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“…The obtained CMC values of Tween Ò 80 and SDS were 0.018 and 7.21 mM, respectively. These concentrations were in good agreement with the previously published data obtained using the same method [36,43]. From Fig.…”

Section: Resultssupporting

confidence: 92%

Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant

Milanović

Krstonošić

Dokić

et al. 2015

J Surfact & Detergents

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Mixtures of a cross-linked polyacrylic acid (Carbopol Ò 940) and two types of surfactants, namely anionic sodium dodecylsulfate (SDS) and nonionic Tween Ò 80, were investigated by viscometry, conductometry, tensiometry, spectrophotometry, fluorimetry and scanning electron microscopy (SEM). The addition of nonionic surfactant decreased the reduced viscosity and the transmittance of the Carbopol Ò polymer aqueous solutions. Furthermore, the interaction between Carbopol Ò 940 and SDS was characterized by two significant concentration values: the critical aggregation concentration of SDS was particularly independent of Carbopol Ò polymer concentration while the polymer saturation point of both surfactants increased with the increase in polymer content. The values of critical aggregation concentration and polymer saturation point obtained using various techniques confirmed the occurrence of Carbopol Ò polymer-surfactant associations. The effect of different SDS and Tween Ò 80 concentrations on the conformation of Carbopol Ò 940 in aqueous solution could be explained through hydrophobic association between surfactant micelles and Carbopol Ò polymer tails and through hydrogen bonding in the case of Tween Ò 80. Additionally, the surfactant-induced structural changes were confirmed in Carbopol Ò 940-SDS and Carbopol Ò 940-Tween Ò 80 aqueous solutions by SEM measurements.

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Section: Resultssupporting

confidence: 92%

Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant

Milanović

Krstonošić

Dokić

et al. 2015

J Surfact & Detergents

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“…The above relationship has been utilized to determine c* of hydroxypropyl cellulose (Martins et al 2006 …”

Section: Second Virial Coefficient (A 2 )mentioning

confidence: 99%

“…Nor the value of A 2 alone can be used for this purpose, as the associative polymers do not always have negative A 2 but still form aggregates. In order to reconcile [g] (a measurement of hydrodynamic volume of the coil) with the second virial coefficient A 2 (a measurement of thermodynamic quality of solventpolymer interaction), an empirical relationship [g] = A 2 M W has been used by many previous authors (Martins et al 2006;Lee 1992;Yamakawa 2001;Teraoka 2002 In the present study, hmHEC polymers with both high and low degrees of hydrophobic modifications have been characterized. For the convenience of analysis, they have been divided in two sets.…”

Section: Introductionmentioning

confidence: 99%

Aqueous solutions of HEC and hmHEC: effects of molecular mass versus hydrophobic associations on hydrodynamic and thermodynamic parameters

Vadodaria

English

2016

Cellulose

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Aqueous solutions of amphiphilic polymers usually comprise of inter-and intramolecular associations of hydrophobic groups often leading to a formation of a rheologically significant reversible network at low concentrations that can be identified using techniques such as static light scattering and rheometry. However, in most studies published till date comparing water soluble polymers with their respective amphiphilic derivatives, it has been very difficult to distinguish between the effects of molecular mass versus hydrophobic associations on hydrodynamic (intrinsic viscosity [g]) and thermodynamic parameters (second virial coefficient A 2 ), owing to the differences between their degrees of polymerization. This study focuses on the dilute and semi-dilute solutions of hydroxyethyl cellulose (HEC) and its amphiphilic derivatives (hmHEC) of the same molecular mass, along with other samples having a different molecular mass using capillary viscometry, rheometry and static light scattering. The weight average molecular masses (M W ) and their distributions for the nonassociative HEC were determined using size exclusion chromatography. Various empirical approaches developed by past authors to determine [g] from dilute solution viscometry data have been discussed. hmHEC with a sufficiently high degree of hydrophobic modification was found to be forming a rheologically significant network in dilute solutions at very low concentrations as opposed to the hmHEC with a much lower degree of hydrophobic modification which also enveloped the hydrophobic groups inside the supramolecular cluster as shown by their [g] and A 2 . The ratio A 2 M W /[g], which takes into account hydrodynamic as well as thermodynamic parameters, was observed to be less for associative polymers compared to that of the non-associative polymers.

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“…Although the formation of micellar aggregates of NaC has been extensively investigated, [3,6,7,13,14,20] few studies have determined the relative viscosity in the absence or presence of polymers. [21,22] As shown in Figure 5B, the g rel versus [NaC] profile reveals three distinct regions: the first extending up to 10.0 mmol L À1 includes the NaC dimer formation region ( Figure 5C); the second between 10.0 and 30.0 mmol L À1 , which characterizes the formation of primary NaC micelles, small aggregates with an average aggregation number of 4-6; [2] and the third region at concentrations above 30.0 mmol L À1 with the formation of secondary NaC micelles. According to Waissbluth et al, [23] in SELF-ASSOCIATION OF NaC AND SDoD WITH PEO this concentration range primary and secondary aggregates coexist.…”

Section: Relative Viscositymentioning

confidence: 98%

Physicochemical Investigation of the Association of the Biosurfactants Sodium Cholate and Sodium Dodecanoate With Poly(ethyleneoxide)

Eising

Felippe

Domingos

2012

Journal of Dispersion Science and Technology

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The association of the biosurfactants sodium cholate (NaC) and sodium dodecanoate (SDoD) with the neutral water-soluble polymer poly(ethyleneoxide) (PEO) was investigated. The physical-chemical techniques employed were pyrene fluorescence, electrical conductivity, and viscosity analysis. It was found that the formation of mixed complexes of PEO-NaC-SDoD occurs only with high SDoD molar fractions of surfactant mixtures. At low SDoD molar fractions the mixed aggregates behave as in the absence of PEO, with the type of micellar aggregates varying with the composition of the surfactant mixtures from a classical spherical formation for SDoD to micellization of NaC.

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Interaction of (hydroxypropyl) cellulose with anionic surfactants in dilute regime

Cited by 25 publications

References 51 publications

Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant

Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant

Aqueous solutions of HEC and hmHEC: effects of molecular mass versus hydrophobic associations on hydrodynamic and thermodynamic parameters

Physicochemical Investigation of the Association of the Biosurfactants Sodium Cholate and Sodium Dodecanoate With Poly(ethyleneoxide)

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Interaction of (hydroxypropyl) cellulose with anionic surfactants in dilute regime

Cited by 25 publications

References 51 publications

Insight into the Interaction Between Carbopol® 940 and Ionic/Nonionic Surfactant

Insight into the Interaction Between Carbopol® 940 and Ionic/Nonionic Surfactant

Aqueous solutions of HEC and hmHEC: effects of molecular mass versus hydrophobic associations on hydrodynamic and thermodynamic parameters

Physicochemical Investigation of the Association of the Biosurfactants Sodium Cholate and Sodium Dodecanoate With Poly(ethyleneoxide)

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Product

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Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant

Insight into the Interaction Between Carbopol^® 940 and Ionic/Nonionic Surfactant