Rheological properties of water-soluble cross-linked xanthan gum |
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| Authors: | Hong Zhang Yongjun Lu Xiaohui Qiu Hao Jin Yuting Liu |
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| Institution: | 1. Shanghai Key Laboratory of Multiphase Materials Chemical Engineering, Lab of Chemical Engineering Rheology, Research Center of Chemical Engineering, East China University of Science and Technology, Shanghai, China;2. Langfang Filial of Research Institute of Petroleum Exploration and Development, Petro China, Langfang, China |
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| Abstract: | Water-soluble crossslinked xanthan gum (CXG) was prepared from xanthan gum (XG) and epichlorohydrin under alkaline condition by ethanol solvent method. Rheological properties and heat resistance performance of different concentrations of aqueous XG and CXG solutions were investigated. The results showed that the apparent viscosity of 4 g · L?1 CXG solution was 2.57 times that of 4 g · L?1 XG solution. The storage modulus G′ and the loss modulus G″ of CXG solutions were greater than those of XG solutions, and viscoelastic and thixotropic properties were more significant in CXG solutions. At 80°C, these two solutions were sheared at 170 s?1 for 90 minutes, the reserved viscosity was 32.30 and 62.15 mPa · s for XG and CXG solutions, respectively. The heat resistance performance of CXG solution was better than that of XG solution. Nonlinear co-rotational Jeffreys model could be applied to describe the flow curves of XG and CXG solutions correctly, and the calculated values were in good agreement with the experimental data. |
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| Keywords: | Xanthan gum epichlorohydrin crosslinking rheological property |
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