Shaikh A. Ali, S. A. Haladu
Sep 1, 2014
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0
Influential Citations
4
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Journal
Polymer International
Abstract
Zwitterion (Z) monomer 3-[diallyl{3-(diethoxyphosphoryl)propyl}ammonio]propane-1-sulfonate underwent cyclocopolymerization with sulfur dioxide to give a new alternating copolymer poly(Z-alt-SO2) in excellent yield (ca 90%). The polyzwitterion (±) (PZ) (i.e. poly(Z-alt-SO2), bearing a diethylphosphonate as well as a sulfonate functionality in each repeat unit, upon ester hydrolysis gave its corresponding pH-responsive polyzwitterionic acid (±) (PZA). The pH-induced equilibrations (+) cationic polyelectrolyte ⇌ (± )P ZA⇌ polyzwitterion/anion ( ±− )( PZAN)⇌ polyzwitterion/dianion ( ±= ) (PZDAN) permitted us to examine the effects of charge types and their densities on the interesting solubility and viscosity behaviours. The apparent protonation constants of the basic functionalities tN ± PO3 2− in ( ±= ) PZDAN and tN ± PO3H 1− in ( ±− ) PZAN in salt-free water and 0.1 mol L −1 NaCl were determined using potentiometric titrations. (±) PZA at a meagre concentration of 20 ppm was found to be an effective antiscalant to inhibit the precipitation of CaSO4 from its supersaturated solution: after 500 and 800 min, the respective scale inhibitions of 86 and 98% indicated its potential use as an effective antiscalant in reverse osmosis plant. © 2014 Society of Chemical Industry