分别用2-丙烯酰胺-2-甲基丙磺酸(AMPS)、二甲基二烯丙基氯化铵(DMDAAC)、N-乙烯基吡咯烷酮(NVP)为单体，亚硫酸氢钠(NaHSO3)、过硫酸钾(KPS)、硝酸铈铵(CAN)为复合引发剂，通过自由基聚合法制备了XG-g-AMPS、XG-g-NVP和XG-g-DMDAAC三种改性聚合物。采用FTIR、EA、1 H NMR、SEM和GPC对接枝产物进行结构表征，并比较了黄原胶(XG)及改性聚合物的溶解性、耐盐性、剪切稀化性和耐热性能。结果表明，改性XG聚合物的溶解度显著提高，同时耐盐性有一定提高，XG-g-NVP、XG-g-DMDAAC在 30%盐溶液中黏度相较XG分别增加了9%，15%。此外，XG-g-NVP和XG-g-DMDAAC溶液的剪切性能值相较XG分别提升了 11%和 45%。研究结果表明通过接枝共聚，改性XG聚合物的溶解性、耐盐性和剪切稀化性能得到提升，拓宽了黄原胶产品在石油工业中的应用。
Preparation and properties of grafted modified xanthan gum
Xanthan gum(XG)was modified by grafting and copolymerization to obtain highly soluble XG-g-AMPS,XG-g-NVP and XG-g-DMDAAC,using 2-propylamide-2-methylpropanesulfonic acid(AMPS),dimethyl diallyl ammonium chloride(DMDAAC),N-vinylpyrrolidone(NVP)as monomer,sodium bisul-fite(NaHSO3),potassium persulfate(KPS)and ammonium cerium nitrate(CAN)as composite initia-tors.The structure and morphology of modified polymers were characterized by FTIR,EA,1 H NMR,SEM,and GPC.The solubility,salt resistance,shear thinning,and heat resistance of XG and XG-modified poly-mers were studied and compared.The results showed that the solubility of the modified XG polymer was significantly improved,the salt resistance was improved,and the viscosity of XG-g-NVP and XG-g-DM-DAAC in 30%saline solution increased by 9%and 15%,respectively,compared with XG.In addition,the shear performance values of XG-g-NVP and XG-g-DMDAAC solutions were improved by 11%and 45%,respectively.The results show that the modified XG polymer has significantly improved solubility,salt resistance,and shear thinning properties through grafting and copolymerization.As an drilling monoa-gent,modified XG polymer broadens the use of xanthan gum in the petroleum industry.
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