pH值对海藻酸钠溶液黏度及体系中氢键的影响规律

doi:10.11896/cldb.18020101

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Abstract Aiming at analyzing the viscosity variation and the formation mechanism of sodium alginate (SA) solution under various pH values, the rheological curves of SA solution at various pH values were measured first. Furthermore, the characteristic absorption peaks of the hydroxyl groups in the FTIR spectra of each SA solution were fitted by Gaussian multi-peaks-fitting method. According to the fitting results, the types and the relative strength of hydrogen bonds in the SA solution system were calculated. Meanwhile, the effect of storage duration on the viscosity of SA solution with various pH values and the hydrogen bond strength in the system was also investigated. It could be found from the results that the shear thinning existed in SA solutions with different pH values, and the SA solution viscosity declined with the increase of pH value. In addition, the intermolecular and intramolecular hydrogen bonds were observed in the SA solution system. The relative strength of the intermolecular hydrogen bonds in SA solution dropped with the rising pH values. Meanwhile, the increase of negative charge on the surface of SA enlarged the electrostatic repulsion between SA molecules, resulting in a decrease of viscosity. After being refrigerated storage for 24h, the relative strength of intermolecular hydrogen bonds in SA solution with pH values of 5 and 9 increase by 4.22% and 20.13%, respectively, which contributed to the rise of the viscosity of SA solution. However, there was only a 0.29% increase in the relative strength of intermolecular hydrogen bonds in the SA solution system with a pH value of 7, accordingly, the viscosity of this solution remained almost invariant.

Key words： hydrogen bond viscosity Gaussian multi-peaks-fitting method FTIR spectrum sodium alginate

Published: 28 April 2019

CLC number:

TB303

Fund:This work was financially supported by the Key Research and Development Plan Project of Anhui Province (1804a09020077), Science and Technology Plan Project of Wuhu (2017yf14), Middle-aged and Young Talent Project of Anhui Polytechnic University (2016BJRC007) and the Graduate Student Innovation Project of Anhui Polytechnic University (2017-12).

About author:: Zongqian Wang, Ph.D. of Engineering, associate professor, Master Instructor, head of Anhui Textile Dyeing and Printing Industry Technology Center, dean of Dyeing and Finishing Department. Mainly engaged in structural control and molding technology of functio-nal fiber, advanced dyeing and finishing technology and theory, and clean production of feather and down.

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Cite this article:

WANG Zongqian,YANG Haiwei. Impact of pH Values on Viscosity of Sodium Alginate Solution and Hydrogen Bonds in the System[J]. Materials Reports, 2019, 33(8): 1289-1292.

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http://www.mater-rep.com/EN/10.11896/cldb.18020101 OR http://www.mater-rep.com/EN/Y2019/V33/I8/1289

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