Abstract
Diallyl[3-(diethoxyphosphoryl)propyl](3-ethoxycarbonylpropyl)ammonium chloride [ (CH2CH=CH2)2N+{(CH2)3PO3Et2} {(CH2)3CO2Et} Cl−], a new diallyl quaternary ammonium salt, has been cyclopolymerized to its cationic polyelectrolyte having pyrrolidine rings embedded in the polymer backbone. The polymer represents the first example of a cyclopolymer in which each repeating unit contains a propylphosphonate as well as a propylcarboxylate pendant. The hydrolysis of one, two or all the three-ester groups in the polymer afforded a series of pH-responsive macromolecules having identical degree of polymerization, which permitted a meaningful comparison of their solution behaviors. Apparent pK as of the triprotic repeating unit have been determined to be 2.52, 5.32 for 9.02 for the functionalities –PO3H2, −CO2H, and –PO3H−, respectively. The completely hydrolyzed polymer containing PO3H2 and CO2H groups demonstrated remarkable antiscalant behavior; at a concentration of 10 ppm, it inhibited the scaling of CaSO4 from its supersaturated solution with an inhibition efficiency of 100 % for over 500 min. The polymer may thus be exploited as an antiscalant in reverse osmosis plants.
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Acknowledgments
This project was funded by the National Plan for Science, Technology and Innovation (MAARIFAH)—King Abdulaziz City for Science and Technology – through the Science & Technology Unit at King Fahd University of Petroleum & Minerals (KFUPM), the Kingdom of Saudi Arabia, award number (11-ADV2132-04). The authors gratefully acknowledge the facilities provided by KFUPM.
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Ali, S.A., Haladu, S.A. & El-Sharif, A.M.Z. Synthesis and application of a cyclopolymer bearing a propylphosphonic acid and a propylcarboxylic acid pendants in the same repeating unit. J Polym Res 23, 167 (2016). https://doi.org/10.1007/s10965-016-1006-5
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DOI: https://doi.org/10.1007/s10965-016-1006-5