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Colloid and Polymer Science

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01-04-2013 | Original Contribution

Effect of carbon chain length of monocarboxylic acids on cloud point temperature of poly(2-ethyl-2-oxazoline)

Authors: Jaweria Ambreen, Jinxian Yang, Xiaodong Ye, Mohammad Siddiq

Published in: Colloid and Polymer Science | Issue 4/2013

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Abstract

The temperature-induced phase transition of poly(2-ethyl-2-oxazoline) (PEtOx) aqueous solution under mixing with a series of small carboxylic acids has been studied by turbidity measurements and laser light scattering. It has been found that cloud point temperature (T _cp) of the PEtOx was changed to varying degrees depending upon the pH, ionic strength, molar ratio of acids to 2-ethyl-2-oxazoline unit, and carbon chain length of small carboxylic acids. Significant change in T _cp was observed in the case of hexanoic acid. At acidic pH, an increase in the molar ratio of hexanoic acid to the 2-ethyl-2-oxazoline unit gradually decreased the phase transition temperature of the polymer as compared to the T _cp of pure PEtOx. At original pH 6 (pH > pK _a), T _cp shifts to higher value than that of pure PEtOx for lower molar ratios and decreased later on with increasing the molar ratio. The shift in the T _cp is described based on the differences in the driving force of phase transition, including hydrogen bonding between small carboxylic acids and PEtOx polymer and hydrophobic interaction.

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Title: Effect of carbon chain length of monocarboxylic acids on cloud point temperature of poly(2-ethyl-2-oxazoline)
Authors: Jaweria Ambreen
Jinxian Yang
Xiaodong Ye
Mohammad Siddiq
Publication date: 01-04-2013
Publisher: Springer-Verlag
Published in: Colloid and Polymer Science / Issue 4/2013
Print ISSN: 0303-402X
Electronic ISSN: 1435-1536
DOI: https://doi.org/10.1007/s00396-012-2810-z

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