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Interaction of (Hydroxypropylmethyl)cellulose with Anionic Surfactants
Author(s) -
de Martins Ricardo M.,
Becker Cristiane M.,
Samios Dimitrios,
Bica Clara I. D.
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200651339
Subject(s) - micelle , small angle x ray scattering , pulmonary surfactant , dynamic light scattering , aggregation number , critical micelle concentration , aqueous solution , conductivity , chemical engineering , analytical chemistry (journal) , chemistry , materials science , cellulose , polymer , scattering , chromatography , organic chemistry , nanoparticle , nanotechnology , optics , physics , engineering
The aggregation process between (hydroxypropylmethyl)cellulose (HPMC 0.20% m/m) and three anionic surfactants namely sodium cholate (CS), sodium deoxycholate (DC) and sodium dodecylsulphate (SDS), in aqueous dilute solutions, was investigated by fluorescence, electrical conductivity, dynamic light scattering (DLS) and small angle X‐ray scattering (SAXS) techniques. Through fluorescence, the critical micelle concentration (CMC) and critical aggregation concentration (CAC) of the systems were obtained in good agreement with those obtained from conductivity. Also by means of conductivity measurements, once the experiments were undertaken at four temperatures, the thermodynamic parameters of the micellization process were calculated. From DLS, the relaxation time distribution functions were analyzed by REPES Routine, revealing that the surfactants bind to the polymer before CAC as well as the formation of free micelles at high surfactant content. The SAXS technique confirmed the existence of such free micelles.