Journal
MACROMOLECULAR CHEMISTRY AND PHYSICS
Volume 213, Issue 3, Pages 301-314Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/macp.201100468
Keywords
block copolymers; LCST; PNIPAM; RAFT; star polymers
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Funding
- DAAD
- CONACYT (Mexico) [SEP2006-60792]
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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 degrees 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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