以丙烯酰胺(AM)、疏水单体烯丙基十二胺、两性可聚合型离子表面活性剂(H-66)为原料,通过自由基水溶液聚合制备了一种聚丙烯酰胺类聚合物(RDTA).通过 1HNMR、13CNMR、FTIR 和 MS 表征了聚合物结构,通过表观黏度、SEM和流变性能测试了RDTA在不同溶液中的缔合效应,考察了该缔合行为与温度的关系.结果表明,RDTA的临界缔合质量分数为 0.25%～0.30%.盐离子对RDTA高分子链的刺激作用能够增强该分子链的结构黏度.弹性模量随RDTA质量分数的增加而增大,溶液体系表现为弹性体,体系的空间结构更加密集.在70、90、120℃和170 s-1剪切下,质量分数0.5%的RDTA盐溶液(以质量分数6%的NaCl水溶液为溶剂)中剪切时间<300 s时,溶液表观黏度呈现缓慢上升趋势,说明RDTA在NaCl水溶液中存在盐刺激RDTA溶液增稠的现象,继续剪切1 h后,剩余表观黏度仍保持在60 mPa·s以上.
Synthesis and performance evaluation of temperature-resistant and salt-resistant hydrophobic associative polymer
Polyacrylamide polymer(RDTA)was prepared from free radical aqueous solution polymerization of acrylamide(AM),hydrophobic monomer allyl group dodecylamine and amphoteric polymerizable ionic surfactant(H-66),and characterized by 1HNMR,13CNMR,FTIR and MS.The association performance of RDTA in different solutions and the relationship between the association behavior and temperature were further investigated through apparent viscosity,SEM,and rheological properties tests.The results indicated that the critical association mass fraction of RDTA was between 0.25%and 0.30%.The stimulation effect of salt ions on RDTA polymer chains could enhance the structural viscosity of the molecular chain.Moreover,the elastic modulus increased with the increment of RDTA mass fraction,and the solution system exhibited elasticity,resulting in a denser spatial structure.Under shear conditions of 170 s-1 and temperatures of 70,90 and 120℃,RDTA salt solution with a mass fraction of 0.5%(using mass fraction of 6%NaCl as solvent)showed a shear time of<300 s,while a slow upward trend for apparent viscosity of solution,indicating that salt stimulated RDTA solution thickening in NaCl aqueous solution.After further shearing for 1 h,the residual apparent viscosity of shearing remained above 60 mPa·s.
hydrophobic associative polyacrylamidesalt resistanceviscoelasticitytemperature and shear resistanceoil field chemicals
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