Transport properties of some cationic amphiphilic polysaccharides: Effects of the side‐chain length and solvent polarity

Abstract

The transport properties of polyelectrolytes with N-alkyl-N,N-dimethyl-N-(2-hydroxypropyl)ammonium chloride pendent groups (alkyl ¼ octyl, dodecyl, or cetyl) randomly distributed along a polysaccharide backbone (dextran) in solutions were studied with viscometry and conductometry. This investigation mainly considered the influence of the side-chain length and the solvent polarity on the polyelectrolyte behavior in salt-free aqueous solutions. The viscometric data indicated that all the copolymers exhibited polyelectrolyte behavior, and they were plotted in terms of the Rao equation. The viscosity of the polycation with dodecyl as alkyl substituent was also measured in solvent mixtures of water and methanol. The conductometric behavior of these cationic polysaccharides was found to be influenced by the alkyl side-chain length and the solvent polarity. A nonlinear dependence of the equivalent conductivity on the dielectric constant of the solvent was observed.

Cationization of polysaccharides: A path to greener derivatives with many industrial applications

“…These polysaccharides effectively interacted with biological surfactants such as biliar salts, and thus presented potentiality as hipocolesteremic agents [77,81]. The cationized polysaccharides also interacted with different sodium alkyl sulfates [79,[82][83][84], and with cationic surfactants [85]; the electrical conductivity and viscosity properties in different solvents [86][87][88][89][90][91], the thermodinamic interaction with water [92], as well as their applications in clay flocculation were evaluated [93][94][95]. The interaction between hydrophobically modified cationic polysaccharides based on dextran and a flavonoid drug (rutin) was studied in view of drug delivery applications [80].…”

“…Thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) were used to study product stability with regard to native polysaccharide [23,27,100,113,157]. The rheological behavior of different cationic polysaccharides was also characterized [58,59,[87][88][89][90][91]100,157,[186][187][188][189].…”