Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (9): 1061-1069.DOI: 10.11944/j.issn.1000-0518.2015.09.150111

• Full Papers • Previous Articles     Next Articles

Synthesis of Sodium Trimetaphosphate Crosslinked Xanthan Gum and Rheological Properties of Its Aqueous Solution

LIU Rua,LI Haipinga,HOU Wanguoab*()   

  1. aNational Engineering Research Center for Colloidal Materials,Shandong Univerisy,Ji'nan 250100,China
    bKey Laboratory of Colloid and Interface Chemistry(Ministry of Education),Shandong University,Ji'nan 250100,China
  • Received:2015-03-23 Accepted:2015-05-17 Published:2015-08-31 Online:2015-08-31
  • Contact: HOU Wanguo
  • Supported by:
    Supported by the National Natural Science Foundation of China(No.21173135, No.21403128)

Abstract:

A water-soluble weakly crosslinked xanthan gum(XG) was synthesized using sodium trimetaphosphate(STMP) as a crosslinker, and the synthesis conditions were optimized based on the viscosity of the STMP crosslinked XG(denoted as SP-c-XG) solutions. Effects of electrolyte(NaCl and CaCl2) mass fraction(0~5.0%), pH(2~11), and temperature(20~70 ℃) on the rheological properties of the SP-c-XG solutions were investigated and compared with those of XG solutions. The results show that, under the studied conditions, the rheological curves of both SP-c-XG and XG solutions are pseudoplastic and can be described by Herschel-Bulkley model. The yield stress, apparent viscosity and dynamic moduli of the SP-c-XG and XG solutions initially decrease and then increase with increasing electrolyte concentration, but they initially increase and then decrease with increasing pH. Increasing temperature results in a decrease in these rheological parameter values for both SP-c-XG and XG solutions. The rheological properties of the SP-c-XG solution are similar to those of the XG solution. However, compared with the XG solution, the SP-c-XG solution exhibits higher yield stress and apparent viscosity, especially stronger elasticity and temperature resistance, indicating its use potential in enhanced oil recovery.

Key words: xanthan gum, sodium trimetaphosphate, crosslink, rheology, temperature resistance