STUDIES OF GEL FORMATION, PHASE-BEHAVIOR AND SURFACE-TENSION IN MIXTURES OF A HYDROPHOBICALLY MODIFIED CATIONIC CELLULOSE POLYMER AND SURFACTANT

The interaction of a variety of surfactants-anionic, cationic and non-ionic-with a hydrophobically modified cationic cellulosic polymer has been studied by solubility, rheology and surface tension methods. Compared with unsubstituted analogs this polymer is different inasmuch as it forms gels with anionic surfactants in the resolubilization zone (excess surfactant) as well as in the pre-precipitation zone. The gels were investigated in detail by mechanical oscillatory measurements and the results have been analyzed by methods similar to those used for complex dielectrics. Evidence is also provided of interaction with cationic surfactants and non-ionic surfactants.