Citation:
WU Wei, ZHANG Ling-Yun, YAN Hu-Sheng. Synthesis and Scale Inhibition Performance of Poly(acrylic acid) with Narrow Molecular Distribution[J]. Chinese Journal of Applied Chemistry,
;2007, 24(9): 1050-1053.
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Poly(acrylic acid)(Mn 2 400~9 000) was prepared by reversible addition-fragmentation chain transfer(RAFT) polymerization with water as the solvent. GPC analysis indicats that the polymer possesses narrow molecular distribution(the polydispersity index PDI was ~1.2). Scale inhibition test indicates that the poly(acrylic acid) prepared by RAFT has better scale inhibition performance than a commercial poly(acrylic acid) scale inhibitor, which was prepared by traditional radical polymerization. For example, when the concentration of poly(acrylic acid) with a molecular mass of ~2 400 was 2 mg/L or 10 mg/L, the scale inhibition against CaCO3 was 83.8% or 97.5%, respectively, while the scale inhibition against CaCO3 of the commercial poly(acrylic acid) scale inhibitor was 21.3% or 42.9%, respectively, at the same concentration. The scale inhibition performance decreases with temperature raising(50~90℃). However, the decreased extent for poly(acrylic acid) prepared by RAFT was markedly less than that for the commercial poly(acrylic acid) scale inhibitor. The difference between scale inhibition performances of the two inhibitors is maximal at 80℃, which is usually the maximal temperature in the practical cooling systems. The smaller the molecular mass of the poly(acrylic acid) in the range studied, the better the scale inhibition performance.
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