Poly acrylic acid (PAA) and polyepoxysuccinic acid (PESA) were investigated as scale inhibitors. The static experiments certified that PAA was superior to PESA for the inhibition of calcium carbonate in the low molecular weight range. The X-ray diffraction patterns suggest that the effect of PAA on the calcite (1 0 4) and (1 1 0) crystal plane was more obvious. Scanning electron microscopy was used to study the surface morphology of the depositions, which indicated that the addition of scale inhibitors could disturb the normal growth of CaCO₃ scale. The transmittance ratio of ferric oxide demonstrated that PAA had a better dispersion performance than PESA. The molecular dynamics simulation and quantum calculation were selected to theoretically explore the mechanism and structure of scale inhibitors, indicating that the interaction of PAA with (1 0 4) and (1 1 0) calcite crystal surfaces was stronger than PESA. In addition, the results indicated that the PAA with negative charge more easily adsorbed free Ca²⁺ in the aqueous phase. Based on these observations, PAA exhibited better scale inhibition and dispersion effects than PESA in the case of low molecular weight.

中文翻译：

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低分子量羧酸聚合物作为碳酸钙垢抑制剂的实验和理论研究

研究了聚丙烯酸（PAA）和聚环氧琥珀酸（PESA）作为阻垢剂。静态实验证明，在低分子量范围内，PAA在抑制碳酸钙方面优于PESA。X射线衍射图表明，PAA对方解石（1 0 4）和（1 1 0）晶面的影响更为明显。用扫描电子显微镜研究了沉积物的表面形态，这表明添加阻垢剂可能会干扰CaCO ₃的正常生长。规模。三氧化二铁的透射比表明，PAA的分散性能优于PESA。选择分子动力学模拟和量子计算从理论上探讨了阻垢剂的机理和结构，表明PAA与（1 0 4）和（1 1 0）方解石晶体表面的相互作用强于PESA。另外，结果表明带负电荷的PAA更容易吸附水相中的游离Ca ²⁺。基于这些观察，在低分子量的情况下，PAA比PESA表现出更好的阻垢和分散效果。