Preparation and rheological properties of associative salt tolerant polymer by inverse-phase emulsion polymerization
An associative salt tolerant polymer p(AM/AMC12S/GTE-10)was prepared from reverse-phase emulsion polymerization of acrylamide(AM),2-acrylamide-sodium dodecyl sulfonate(AMC12S)and hydrophobic monomer 29-(4-octylphenoxy)-3,6,9,12,15,18,21,24,27-nonaoxanonacosyl methacrylate(GTE-10).The structure and morphology of the obtained polymer were then characterized by FTIR,1HNMR,SEM,TEM and laser particle size analyzer,followed by evaluation on its rheological properties,thixotropic properties and viscoelasticity.The results showed that the hydrophobic monomer GTE-10 was successfully introduced into the polymer,and the particle size distribution of the emulsion after polymerization was narrow and uniform.The addition of salt(NaCl,CaCl2)made the aggregation of p(AM/AMC12S/GTE-10)molecules more compact and the spatial network structure formed more stable.p(AM/AMC12S/GTE-10)polymer aqueous solution with a mass fraction of 0.7%showed good temperature resistance at 140℃.After being sheared at 120℃and 170 s-1 for 1 h,the polymer solutions with a mass fraction of 0.7%prepared in mass concentration of 20000 mg/L NaCl and CaCl2 aqueous solutions exhibited apparent viscosities of 64.8 and 54.1 mPa·s,respectively,with good shear recovery performance.Meanwhile,the energy storage modulus was higher than the loss modulus,and the complex reaction between metal ion and phenoxyethylene group enhanced the intermolecular force,leading to more stable spatial structure and higher viscoelasticity.
inverse-phase emulsion polymerizationsalt tolerancerheological propertyviscoelasticitythixotropyoil field chemicals
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