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Self-assembly and rheological behaviors of intermacromolecular complexes consisting of oppositely charged fluorinated guar gums
Carbohydrate Polymers ( IF 11.2 ) Pub Date : 2018-01-02 , DOI: 10.1016/j.carbpol.2018.01.001
Chen Wang , Liewei Qiu , Tao Wang

We synthesized fluorinated cationic/anionic guar gums (FCGG and FAGG) and characterized these species using Fourier transform infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy. The degree of fluorine substitution of FCGG (0.26%) and FAGG (0.21%) was calculated by elemental analysis. In addition, we explored the self-assembly and rheological behaviors of FCGG-FAGG complexes by viscometry, scanning electron microscopy, light scattering, fluorescence spectroscopy, and rheometry. The maximum viscosity and molecular weights were observed with a FAGG:FCGG mass ratio of 7.0:3.0, denoted by COMP. Moreover, FAGG-FCGG interactions in COMP led to the lowest shape factor and critical associating concentration. Additionally, the relaxation time and crossover modulus of COMP (6.65 s and 0.90 Pa, respectively) were remarkably higher than those of FCGG and FAGG alone. Finally, viscoelastic hysteresis loops emerged for FAGG and COMP. The results suggested that the self-assembly behaviors of FAGG-FCGG were influenced by both ionic and fluorinated groups.



中文翻译:

带有相反电荷的氟瓜尔胶组成的大分子间复合物的自组装和流变行为

我们合成了氟化的阳离子/阴离子瓜尔胶(FCGG和FAGG),并使用傅立叶变换红外光谱和1对这些物种进行了表征H核磁共振波谱学。通过元素分析计算出FCGG(0.26%)和FAGG(0.21%)的氟取代度。此外,我们通过粘度测定,扫描电子显微镜,光散射,荧光光谱和流变学研究了FCGG-FAGG配合物的自组装和流变行为。用COMP表示的FAGG∶FCGG质量比为7.0∶3.0观察到最大粘度和分子量。此外,COMP中的FAGG-FCGG相互作用导致最低的形状因子和临界缔合浓度。此外,COMP的弛豫时间和穿越模量(分别为6.65 s和0.90 Pa)明显高于单独的FCGG和FAGG。最终,出现了FAGG和COMP的粘弹性磁滞回线。

更新日期:2018-01-03
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