Abstract
Rheological Study of Aqueous Solutions of Hydrophobically-Associating Derivatives of Propylene Glycol Alginate (Pga)
Highlights
We report our results on the physicochemical study in aqueous solution of new amphiphilic polysaccharide derivatives, obtained by attachment of long-chain alkylamines (Cn-NH2 n = 8, 12, 14) onto propylene glycol alginate (PGA), a partially esterified derivative of sodium alginate [8, 9, 10, 11]
Alternating tests with different shear rates have shown that the intermolecular hydrophobic interactions can be quickly disrupted at high shear rates, whereas, once disrupted and suddenly submitted to low shear rate, they slowly build up [10]
The characteristic time for structure recovery, or in other terms for the re-establishment of hydrophobic interactions, was of the order of several hundred seconds, in agreement with reported values for other systems [7]. This time is much higher than that associated with the breaking down of the hydrophobic interactions
Summary
Alternating tests with different shear rates have shown that the intermolecular hydrophobic interactions can be quickly disrupted at high shear rates, whereas, once disrupted and suddenly submitted to low shear rate, they slowly build up [10]. The characteristic time for structure recovery, or in other terms for the re-establishment of hydrophobic interactions, was of the order of several hundred seconds, in agreement with reported values for other systems [7].
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