Synthesis and characterization of modified xanthan gum using poly(maleic anhydride/1-octadecene)

Abstract

In this study, modified xanthan gum was prepared by esterification of xanthan gum (XG) with poly(maleic anhydride/1-octadecene) (PMAO) in order to improve the shearing and thermal degradation performance. The structure and molecular weight (M w ) of the modified xanthan gums (named as PX) and XG were characterized by FT-IR, 1 H NMR, and static light scattering. The radius of gyration (R g ) and hydrodynamic radius (R h ) of these polymers in aqueous solution were obtained by light scattering measurement. From thermal gravimetric analysis (TGA) measurements, PX and XG have similar thermal stability. According to rheological determinations, PX exhibits a more outstanding property of resistance to shear force and displays highly enhanced viscoelastic behaviors. Also, it is found that PX solution has better performance on salt tolerance and temperature resistance due to the crosslinkage between XG and PMAO. In addition, the mechanical shear degradation and thermal degradation data show that PX solution keeps higher viscosity than XG.

Effective Modified Xanthan Gum Fluid Loss Agent for High-Temperature Water-Based Drilling Fluid and the Filtration Control Mechanism

“…The absorption peaks that appeared at 1624 and 1728 cm –1 were caused by symmetric and asymmetric stretching vibration of CO. These results are in agreement with reported data. − For the XG- g -AAA curve (curve b), the peaks at 1040 and 2930 cm –1 are characteristic absorption peaks of XG retained by the graft copolymer. The broad absorption band at 3436 cm –1 was due to the overlap of O–H stretching of XG and N–H stretching of AM .…”

Xanthan gum derivatives: review of synthesis, properties and diverse applications

“…The authors further acknowledged its excellent salt tolerance as well as temperature resistance properties which could be benecial in oil recovery, pharmaceutical and food applications. 156 Tao et al 157 endorsed sodium trimetaphosphate (STMP), a non-toxic and water soluble cyclic triphosphate for the crosslinking of hydroxy groups of XG chains under alkaline condition to design hydrogel disks. One phosphorous group intertwined two sugar rings of different XG chains ( Fig.…”

Enhanced Oil Recovery Performance and Solution Properties of Hydrophobic Associative Xanthan Gum

“…However, in recent years, the research on hydrophobically modified xanthan gum was mostly focused on the pharmaceutical field. − There were few studies on the petroleum industry, which were mainly involved the application in fracturing fluids. ,,− Therefore, this work studies the potential of hydrophobically associated xanthan gum as an oil-displacing agent to enhance oil recovery.…”

“…After shearing at 80 °C and 170 s −1 for 120 min, the viscosities of XG and HAXG solutions were 35.55 and 108.96 mPa s, respectively, indicating that the HAXG solution had better temperature and shear resistance. Wang et al 21 used the maleic anhydride/1-octadecene esterification method to prepare modified xanthan gum, which improved the performance on salt tolerance, temperature resistance, and shear endurance of xanthan gum. Sara et al 22 used the Williamson synthesis method to graft octyl groups onto the xanthan gum backbone and prepared hydrophobically modified xanthan gum derivatives with different degrees of substitution using ethanol and DMSO as two solvents.…”