Synthesis And Properties Of Hydrophobic Associated Polymer P (AM - AMPS - SA)

The hydrophobically associating polymerP (AM-AMPS-SA) was prepared from acrylamide (AM),2-acrylamido-2-methyl propane sulfonic acid (AMPS) and stearyl acrylate (SA) via micellar free radical copolymerization method in this thesis, with sodium dodecyl sulfate (SDS) as the emulsifier and ammonium persulfate (APS) as the initiator.IR and’Hnuclearmagnetic resonance(’H-NMR) analysis illustrates that the molecular chain of the prepared polymer is consist of the above three structure units AM, AMPS and SA. And the elemental analysis experiment demonstrates that the amount of hydrophobic structure units becomes larger as SA proportion increases. While the intrinsic viscosity reduces with the increase of the hydrophobic structure units in the copolymer, the concentration of NaCl and the temperature.Investigation of the solution properties of P(AM-AMPS-SA) reveals that the critical association concentration is0.2g/dL. As the shear rate keeps growing, P(AM-AMPS-SA) so-lutionviscosity drops gradually. However, the solution viscosity of P(AM-AMPS-SA) is obviously higher than that of PAM when providing the same shear rate, which indicates that P(AM-AMPS-SA) solution shear resistance is superior to PAM solution. When letting it stand for a while after high speed shearing, the viscosity of P(AM-AMPS-SA) solution can recover to over90%of that of the solution without shearing, showing that the P(AM-AMPS-SA) solution possesses good shear recovery performance. The viscosity of the P(AM-AMPS-SA) solution decreases as expected when rising the temperature. However, when compared with PAM solution, the P(AM-AMPS-SA) solution get a much higher viscosity under the same temperature, which means a better temperature resistance. In addition, the viscosity of the P(AM-AMPS-SA) salt solution drops rapidly within the range of0-1%salt concentration, then the change tends to be gentle. And the apparent viscosity of P(AM-AMPS-SA) CaCl2solution is higher than that of NaCl solution. Moreover, P(AM-AMPS-SA) bearing1%hydrophobic monomer shows a higher salt solution apparent viscosity than other P(AM-AMPS-SA)polym-ers.The temperature resistance and salt resistance of the polymer can be increased by adding the AMPS ratio appropriately.The viscosity of the polymer P(AM-AMPS-SA) solution increases first and then decreases with the the surfactant concentration growing, however, there is little change to the PAM solution. There is an interleaved, gathered, smooth and strong microscopic network structure in the polymer P(AM-AMPS-SA) solution, while the structure of PAM solution is flocculent and loosely, and not stable enough.