Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science & Technology, Xi'an 710021, PR China.
Carbohydr Polym. 2013 Jun 20;95(2):637-43. doi: 10.1016/j.carbpol.2013.02.064. Epub 2013 Mar 5.
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-hexafluoro-1-butanol. The molecular structure, associating and rheological behaviors of FCGG were studied by the FT-IR, (19)F 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 3.3s. At low shear rates (<20s(-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°C and 51.33% at 60°C, respectively. The data indicate that FCGG has much better heat resistance.
氟阳离子瓜尔胶（FCGG）是由阳离子瓜尔胶（CGG）和氟代反应性单体（FAM）制备的。FAM 是由异佛尔酮二异氰酸酯和 2,2,3,4,4,4-六氟-1-丁醇合成的。通过傅里叶变换红外光谱（FT-IR）、（19）F 核磁共振（NMR）、X 射线衍射、动态流变仪和荧光光谱分别研究了 FCGG 的分子结构、缔合和流变行为。结果表明，FAM 成功地掺入 CGG 中。随着取代度（DS）的增加，结晶度从 3.01%降低至 0.67%，特征松弛时间从 0.10s 显著变化至 3.3s。在低剪切速率（<20s(-1)）下，FCGG 溶液的粘度随剪切速率的增加而增加。DS 越大，表观粘度越高。在 30°C 时，FCGG 的粘度保留因子可达 126.97%，在 60°C 时可达 51.33%。数据表明 FCGG 具有更好的耐热性。
