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      저자 : Shaikh Asrof Ali (검색결과 2 건)
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        Diallylbis(3-ethoxycarbonylpropyl)ammonium Chloride: A Symmetrically Substituted Monomer for the Synthesis of an Alternate Zwitterionic-Anionic Cyclopolymer

        Shaikh Asrof Ali,Shamsuddeen Abdullahi Haladu,Mohammed Zamil El-Sharif 한국고분자학회 2016 Macromolecular Research Vol.24 No.2

        Diallylbis[(3-ethoxycarbonylpropyl)ammonium chloride] (CH2=CHCH2)2N+[(CH2)3CO2Et]2, a new symmetrical diallyl quaternary ammonium salt, has been cyclopolymerized to its cationic polyelectrolyte (CPE) (+) I having pyrrolidine rings embedded in the polymer backbone. Polymer I would exemplify for the first time a cyclopolymer with each repeating unit bearing two identical 3-carboxypropyl pendants. (CPE) (+) I upon hydrolysis afforded pH-responsive polycationic acid (+) II, which upon successive deprotonation was transformed into a polyzwitterion acid (±) III and polyzwitterion-anion (± -) IV. Because of similar degrees of polymerization for I-IV, a meaningful comparison of their solution properties was possible. While I, II, and IV demonstrated polyelectrolyte like viscosity behavior, (±) III showed anti-polyelectrolyte properties. The anionic portion in (± -) IV controlled its solution properties. Polymer (± -) IV demonstrated remarkable antiscalant behavior; at a concentration of 15 ppm, it inhibited the precipitation of CaSO4 from its supersaturated solution with a scale inhibition efficiency of ≈100% even after 300 min. This study opens up the possibility of using the current polymer as an antiscalant in reverse osmosis plants.

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        Phase diagrams of urethanized polyvinyl alcohol with a series of hydrophobically modified pH-responsive polymers containing amino acid residues

        Shaikh Asrof Ali 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.10

        The composition and phase diagram of aqueous two-phase systems (ATPSs) of urethanized polyvinyl alcohol (UPVA) and a series of ionic co- and terpolymers (IPs) of pH-responsive hydrophilic diallylammonioethanoate,0-3mol% hydrophobic dodecyldiallylammonium chloride, and SO2 have been studied for the first time. The presence of unquenched nitrogen valency in the repeat units of the IPs permitted the change of the charge types and their densities in the polymer chain. The effects of zwitterionic (Z±) and anionic (A−) charge densities on the polymer backbone, salt (NaCl) concentration, and hydrophobe content on the phase diagrams were investigated. The presence of the hydrophobe in the polymer shifted the binodal downward; magnitude of the shift increased with the increase in the hydrophobe content. The phase separation happened at relatively low total polymer concentrations (much below than 10%), which could be useful in separation and purification of biomaterials.

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