Thermo-associating polymers based on cross-linked 2-acrylamido-methylpropane sulfonic acid, part A: Synthesis and solution behavior

摘要: Abstract A novel thermo-thickening hydrophilic copolymer (CGBA) was prepared by free-radical copolymerization of sodium 2-acrylamido-2-methylpropane sulfonic acid (NaAMPS) with a newly-synthesized thermo-sensitive macromonomer (BA) and cross-linking N,N’-methylenebisacrylamide (MBA) in aqueous solution under optimal conditions. Its viscosity behavior respect to temperature preliminarily evaluated comparison its cross-linked sulfonated (CPAMPS) counterpart (without BA side-chains). Particular attention is dedicated the solutions as studied measurements. In pure water, above 0.5 wt.%, CGBA manifested an abrupt macroscopic property critical association (Tcass), while CPAMPS exhibited shear-thinning following Arrhenius law same The composition length side-chains were identified key parameters envision self-assembling CGBA. results obtained from complementary experiments, performed proton nuclear magnetic resonance (1H-NMR), Differential scanning calorimetry (DSC), pyrene fluorescence showed phase transition Tcass. addition, well Tcass (70 80 °C), oscillatory shear experiments proved that storage loss modulus could be fitted single relation time Maxwell model at low frequencies. Furthermore, magnitude thickening effect modulated using external factors such rates, salinity, pH. This, combination cost-effectiveness, need further broaden established theory comonomer, make this especially interesting for application not only polymer flooding, but also drilling fluid.