Synthesis And Performance Of The Ia-amps-hpa Terpolymer Mechanism

The water soluble polymer IA-AMPS-HPA was prepared by solution polymerization techniques with water as solvent, ammonium persulfate as initiator, isopropanol as chain transfer agent. The monomers are itaconic acid (IA),2-acrylic amide-2-methylpropaneonic acid(AMPS), hydroxypropyl acrylate(HPA). The effects of the reaction temperature, mono-mer ratio, initiator amount, the amount of chain transfer agent, on the synthesis are investi-gated.The optimum synthesis conditions are built by the orthogonal method. The polymers are characterized by IR spectra and TG.The results of static control experiment show that the performance of IA-AMPS-HPA is good at inhibiting the deposition CaCO3. When the concentration of Ca2+ is 6 mmol/L, the concentration of HCO3- is 8mmol/L, the concentrations of polymer is 6 mg/L, The CaCO3 scale inhibitory rate of the polymer IA-AMPS-HPA is 91.3%.The CaCO3 scale appearance and structure messages from SEM and XRD reveal that IA-AMPS-HPA has strong effect on lattice distortion of scale. The interactions between four polymers and calcite crystal surface (104,110) were simulated dynamically by emplo-ying the software Material Studio, then pair correlation function, binding energy, nonbond deformation energies were obtained to discuss the mechanism of scale inhibition. The results from binding energy show that the scale inhibition capacity of polymers against calcite is:IA-AMPS-HPA>AA-AMPS>HPMA>T-225, which is consistent with experimental results; By analyzing pair correlation function of systems, we found that binding energys are mainly come from the contribution of coulomb interaction. Van der waals interaction is against the formation of combined systems on account of its positive value.Polymers deformed violently during the binding process, electrovalent bonds formed between the calcium ions in calcite crystals and the carbonyl oxygen atoms in polymers.