title: Interactions between fluorinated cationic guar gum and surfactants in the dilute and semi-dilute solutions.
abstract: The interactions between the fluorinated cationic guar gum (FCGG) and ionic surfactants including cetyl trimethyl ammonium bromide (CTAB) and sodium lauryl sulfate (SDS) were studied by light scattering, fluorescence spectroscopy, UV-spectrophotometer, (19)F NMR and dynamic rheometer, respectively. The FCGG is prepared with cationic guar gum, isophorone diisocyanate and 2,2,3,4,4,4-hexafluoro-1-butanol. The results show that, with the addition of the surfactants, the stretching degree of the FCGG chains is increased in the FCGG/CTAB solutions, while the dramatical shrinking of FCGG chain, the phase separation and the re-stretched macromolecules appear successively because of the electricity neutralization reaction in the FCGG/SDS system. The mixed hydrophobic domains in all solutions will be reinforced and then dismantled. The solution elasticity shows up the maximum value accordingly. The surfactants can be embedded in the micro-domains and then hinder the fluorinated segmental motions. The interactions between FCGG and SDS are much stronger than those between FCGG and CTAB.
authors.affiliation: Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, PR China. Electronic address: 277365553@qq.com.
authors.forename: Chen
authors.initials: C
authors.lastname: Wang
authors.forename: Xiaorui
authors.initials: X
authors.lastname: Li
authors.forename: Peizhi
authors.initials: P
authors.lastname: Li
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Niu
mesh_terms: D000440:Butanols / Q000737:chemistry; D002412:Cations; D000077286:Cetrimonium; D002593:Cetrimonium Compounds / Q000737:chemistry*; D005685:Galactans / Q000737:chemistry*; D054879:Halogenation; D057927:Hydrophobic and Hydrophilic Interactions; D017953:Isocyanates / Q000737:chemistry; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D008351:Mannans / Q000737:chemistry*; D053149:Plant Gums / Q000737:chemistry*; D012212:Rheology; D012542:Scattering, Radiation; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D000440:Butanols; D002412:Cations; D002593:Cetrimonium Compounds; D005685:Galactans; D017953:Isocyanates; D008351:Mannans; D053149:Plant Gums; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D012967:Sodium Dodecyl Sulfate; C015301:isophorone diisocyanate; C007894:guar gum; D000077286:Cetrimonium
keywords: Fluorinated cationic guar gum; Hydrophobic micro-domain; Interactions; Rheological behaviors; Surfactants