Influence of various series of additives on the clouding behavior of aqueous solutions of triblock copolymers |
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Authors: | Arifa Shaheen Navjot Kaur Rakesh Kumar Mahajan |
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Institution: | (1) Department of Chemistry, Guru Nanak Dev University, Amritsar, 143005, India |
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Abstract: | The cloud point (CP) studies on aqueous solutions of two ethylene oxide-propylene oxide triblock copolymers (EO)2.5(PO)31(EO)2.5 and (EO)13(PO)30(EO)13 with varying number of ethylene oxide (EO) units were carried out in the presence of series of additives, such as alkali,
acids, ionic surfactants, alcohols, salts, and hydrotropes. The results of this study show that sodium hydroxide decreases
the CP of the two copolymers. Acids increase the CP in the order hydrochloric acid > acetic acid > formic acid for both the
triblock copolymers. Hydrotropes increase the CP, whereas salts decrease or increase the CP based on their salting-out/salting-in
nature. Alcohols, which are polar organic additives, affect the CP of the two copolymers differently. The change in the CP
of the triblock copolymers depends upon the structure and concentration of the additives and on the number of EO units of
the two triblock copolymers. |
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Keywords: | Cloud point Hydrotropes Triblock copolymers Ionic surfactants |
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