Journal
POLYMER
Volume 51, Issue 6, Pages 1213-1217Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2009.11.023
Keywords
ATRP; Double stimuli-responsive; Star polymer
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Funding
- German Science Foundation (DFG) [SPP 1259]
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We report on the synthesis and characterization of linear and star-shaped poly(N,N-diethylaminoethyl methacrylate) (PDEA) The synthesis was accomplished by Atom Transfer Radical Polymerization (ATRP) via a core-first approach using sugar-based multifunctional initiators The investigation of the solution properties in water shows that PDEA is both pH- and temperature-responsive, analogous to the behavior of poly(N,N-dimethylaminoethyl methacrylate) (PDMA). In literature, PDEA is frequently referred to as being only pH-sensitive. The critical pH values for the aggregation are close to the apparent pK(a) values in all cases, ie a high charge density is necessary to keep the polymers soluble. The cloud points show a strong dependence on the pH value of the solution but no dependence on either molecular weight or architecture Thus, the two polymers differ only quantitatively, as PDEA has cloud points about 40 K lower than PDMA and critical pH values which are 15-2 units lower than PDMA (C) 2009 Elsevier Ltd. All rights reserved.
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