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Synthesis of double-hydrophilic BAB triblock copolymers via RAFT polymerisation and their thermoresponsive self-assembly in water

 
: Skrabania, K.; Li, W.; Laschewsky, A.

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Macromolecular chemistry and physics 209 (2008), No.13, pp.1389-1403
ISSN: 1022-1352
English
Journal Article
Fraunhofer IAP ()

Abstract
Triblock copolymers of poly(N-isopropylacrylamide)-block-poly(N,N-dimethylacrylamide)-block-pol y(N-isopropylacrylamide) were synthesised via RAFT polymerisation using a symmetrical bistrithio carbonate. Keeping the block length of the permanently hydrophilic middle block constant, the length of the poly(N-isopropylacrylamide) block was varied broadly. The thermoresponsive aggregation of the polymers in water was studied by H-1 NMR, turbidimetry, and dynamic light scattering. The complex aggregation behaviour was block length dependent and occurred under kinetic control. Importantly, different information on the hydrophilic-hydrophobic transition of the poly(N-isopropylacrylamide) block was obtained using the various analytical methods and could not be directly correlated.

: http://publica.fraunhofer.de/documents/N-77721.html