Hydrophobically and cationically modified hydroxyethyl cellulose and their interactions with surfactants

Polysoaps with fluorocarbon hydrophobic chains

“…Still, it is evident that the hydrophobized copolymer series 3a-3c and 4b-4c exhibit substantially lower t] ni values than poly-1 There is no indication of thickening effects as observed fo watersoluble copolymers with a very small fluorocarbon hydrophobe content [5][6][7][8][9][10][11]25]. Though effects due to strongly differing degrees of polymerization cannot be rigorously excluded as the molar masses are unknown, they are highly improbable as the polymerization conditions for the polymers were virtually identical.…”

“…In particular, the use of fluorocarbon hydrophobic chains in polymers has so far been very limited. The few studies have been restricted basically to water-soluble polymers which are weakly substituted with fluorocarbon chains to provide efficient thickeners [5][6][7][8][9][10], or to block copolymers [11][12][13][14][15] or oligomers [16,17] respectively. Examples for water-soluble polymers which are heavily substituted with fluorocarbon chains, as needed for polysoaps to enable intramolecular aggregation, are virtually missing.…”

Interactions between Quaternary Ammonium Surfactant Oligomers and Water-Soluble Modified Guars

“…For HMHPG in the presence of 12-16-12 and 12-20-12 the same milky systems occurred as for pure surfactant solutions. Phase separation of neutral hydrophobic polymers upon addition of ionic surfactants is often observed (24). Attractive forces in the highly charged polymer-surfactant complexes may become dominant and cause a collapse of the aggregates (salt effect).…”

“…In the case of cooperative binding of the surfactant to the polymer this increase is often not large. However, it can become enormous with water-soluble associating polymers (15,(22)(23)(24)(25). Such polymers contain a few grafted hydrophobic side chains ("hydrophobes") which selfassociate intra-and intermolecularly into small aggregates, forming cross-links, to minimize their contact with water.…”

Surfactant interactions with P(AM–AA–BPAM) hydrophobically modified polyelectrolytes

“…Because this kind of polymer-surfactant complex shows some extraordinary rheological properties, they are widely used in tertiary oil recovery, latex paint systems, drug delivery, cosmetic formulation, drag reduction, flocculation, biological/medical, purposes, and so on. [1][2][3] In this study, we were interested in the investigation of the interactions of hydrophobically modified polyelectrolytes with surfactants, including similarly and oppositely charged surfactants and nonionic surfactants, by the measurement of surface tension and solution rheology. AFM was used to investigate the microstructures of the polymer-surfactant complexes.…”