Journal
CARBOHYDRATE POLYMERS
Volume 95, Issue 2, Pages 637-643Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.02.064
Keywords
Cationic guar gum; Fluorinated modification; Hydrophobic micro-domain; Associating behaviors; Rheological behaviors
Categories
Funding
- National Natural Science Foundation of China [50673055, 50973057]
- Natural Science Foundation of Shaanxi Province of China [2010JK433, 2009JQ2004]
- Scientific Research Fund of Shaanxi University of Science and Technology [ZX08-07, BJ09-18, BJ11-10]
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The fluorinated cationic guar gum (FCGG) was prepared with cationic guar gum (CGG) and fluorinated reactive monomer (FAM). FAM was synthesized from isophorone diisocyanate and 2,2,3,4,4,4-hexafluorol-butanol. The molecular structure, associating and rheological behaviors of FCGG were studied by the FT-IR,F-19 NMR, X-ray diffraction, dynamic rheometer and fluorescence spectroscopy, respectively. The results show that FAM is successfully incorporated into CGG. With the increased degree of substitution (DS), the crystallinity is reduced from 3.01 to 0.67% and the characteristic relaxation time is changed significantly from 0.10 to 3.3 s. At low shear rates (<20 s(-1)), the viscosity of FCGG solution increases with the increase of shear rates. The bigger the DS, the higher the apparent viscosity. The viscosity retention factor of FCGG can reach 126.97% at 30 degrees C and 51.33% at 60 degrees C, respectively. The data indicate that FCGG has much better heat resistance. (C) 2013 Elsevier Ltd. All rights reserved.
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