Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5209738 | Reactive and Functional Polymers | 2015 | 10 Pages |
Abstract
The reaction between diallylamine and dimethyl maleate afforded the Michael addition product dimethyl N,N-diallylaspartate [(CH2CH-CH2)2NCH(CO2Me)CH2CO2Me] I, which upon treatment with dry HCl and ester hydrolysis with aqueous HCl gave its hydrochloride salt [(CH2CH-CH2)2NH+CH(CO2Me)CH2CO2Me Clâ] II and N,N-diallylaspartic acid hydrochloride [(CH2CH-CH2)2NH+CH(CO2H)CH2CO2H Clâ] III, respectively. The new monomers II and III underwent cyclopolymerization to give, respectively, cationic polyelectrolytes (CPEs) poly(II) and poly(III). Under the influence of pH, triprotic acid (+) poly(III) was equilibrated to water-insoluble diprotic polyzwitterionic acid (±) IV, water-soluble monoprotic poly(zwitterion-anion) (± â) V, and its conjugate base polydianion (=) VI. The protonation constants of the carboxyl group and trivalent nitrogen in VI have been determined. A 20-ppm concentration of IV is effective in inhibiting the precipitation of CaSO4 from its supersaturated solution with an â 100% scale inhibition efficiency for a duration of 50 h at 40 °C. The aqueous two-phase systems (ATPSs) of VI and polyoxyethylene have been studied. The transformation of water-soluble VI to insoluble IV makes it a recycling ATPS as it can be recycled by precipitation at a lower pH.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Zakariyah A. Jamiu, Hasan A. Al-Muallem, Shaikh A. Ali,