Smart anionic polyelectrolytes based on natural polymer for complexation of cationic surfactant

Abstract

The thermosensitive polyelectrolytes were obtained by grafting 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) onto hydroxypropylcellulose (HPC), a biodegradable polysaccharide. The interactions of the polymers with dodecyltrimethylammonium chloride (DTAC), a model cationic surfactant, were studied. It was found by the measurements of the surface tension and the analysis of fluorescence emission of pyrene used as a fluorescent probe, that the HPC-AMPS graft polymers strongly interact with DTAC with the formation of polymer-surfactant complexes. The critical aggregation concentrations of these polymer-surfactant systems were found to be of the order of 10 À5 mol/dm 3 . The polymers were found to be potentially useful in the purification of water from cationic surfactants.

Cationic Derivatives of Dextran and Hydroxypropylcellulose as Novel Potential Heparin Antagonists

“…These changes are typical of ionically modified thermosensitive polymers showing LCST, both synthetic 50,51 and of natural origin. 52,53 For HPC-APTMAC3 dissolved in PBS the effect of cationic modification and the effect of increased ionic strength cancel each other, so in PBS this polymer shows a LCST value Journal of Medicinal Chemistry ARTICLE similar to that of HPC in water. Moreover, the increase in turbidity is more gradual than in the case of the native HPC.…”

Oligomeric Cationic Polymethacrylates: A Comparison of Methods for Determining Molecular Weight

“…Water-soluble, low molecular weight cationic polymers have found applications in a variety of fields including the pharmaceutical industry as drug delivery systems − or antimicrobial agents, − the cosmetic field as conditioning agents, , and in industrial processes as coagulants or detergents. − The behavior of polymers in such applications is controlled by both their chemical composition and molecular weight, thus illustrating the need for accurate methods to characterize these materials. The determination of the molecular weight of oligomeric cationic species can be difficult using conventional methods such as size exclusion chromatography (SEC) coupled with multiple angle, static light scattering detection, which in principal can give absolute molecular weight distribution(s).…”

High resolution interferometry as a tool for characterization of swelling of weakly charged hydrogels subjected to amphiphile and cyclodextrin exposure

“…Confocal laser scanning microscopy imaging experiments used to determine surfactant distribution inside hydrogels were carried out according to the adopted procedure described elsewhere [27]. Perylene was recrystallized from acetone on the walls of flatbottom flask, and the solvent removed using a water pump.…”

“…Release of counterions associated with the charged polymeric chains contributes through an entropic mechanism to the association [25]. Surfactants interacting with oppositely charged linear or crosslinked polymers tend to aggregate at concentrations much lower than their critical micelle concentration (cmc) in solution [26][27][28]. The presence of interacting polyelectrolytes decreases the repulsive interactions between the surfactant molecules resulting in micelles being formed at a critical aggregation concentration (cac) lower than the cmc.…”