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Authors
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Picos-Corrales, L. A. ; Licea-Claverie, A. ; Cornejo-Bravo, J. M. ; Schwarz, S. ; Arndt, K.-F.
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Title
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Well-defined N-isopropylacrylamide dual sensitive copolymers with LCST~38°C in different architectures: linear, block and star polymers
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Date
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27.01.2012
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Number
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30286
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Abstract
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Reversible addition-fragmentation chain transfer (RAFT) polymerization is used to prepare temperature- and pH-sensitive statistical copolymers with lower critical solution temperature (LCST) close to 38 °C at pH 7.4 based on N-isopropylacrylamide and methacrylic acid derivative comonomers with a pKa close to 6. Statistical copolymers are re-activated to prepare amphiphilic block copolymers and star polymers with cross-linked core. The LCST is maintained by varying the architecture; however, the LCST originated behaviour changes due to self-aggregation. Statistical copolymers and short block copolymers show complex aggregation, whereas mid-size block copolymers and star polymers show shrinkage of aggregate dimensions. The pH of the medium has a profound impact on the self-assembling behaviour of the different polymer architectures.
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Publisher
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Macromolecular Chemistry and Physics
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Wikidata
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Citation
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Macromolecular Chemistry and Physics 213 (2012) 301-314
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DOI
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https://doi.org/10.1002/macp.201100468
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Tags
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