Journal
POLYMER
Volume 54, Issue 20, Pages 5338-5344Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2013.07.061
Keywords
Upper critical solution temperature; pH-sensitivity; Polyethylenimine
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Funding
- Mid-career Researcher Program through the National Research Foundation [2011-0013569]
- Ministry of Science, ICT and Future Planning, Korea
- GAIA project [2013000550004]
- Ministry of Environment, Korea
- Seoul RBD program [ST110017M0209721]
- National Research Foundation of Korea [2011-0013569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We introduced upper critical solution temperature (UCST) properties into an amine-rich polymer, branched polyethylenimine (b-PEI) by a simple sulfopropylation reaction. The phase transition behavior of the N-sulfopropylated b-PEI (PS-PEI) derivatives was influenced by the degree of sulfopropylation, concentration, molecular weight, ionic strength, and pH. In particular, the phase transition temperature of PS-PEI was strongly dependent upon pH. As the pH decreased, the protonable amine residues of PS-PEI became positively charged and interacted strongly with the negatively charged sulfonate residues, exhibiting the increase of the UCST phase transition temperature. (c) 2013 Elsevier Ltd. All rights reserved.
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