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Thermo-responsive poly(methyl methacrylate)-block-poly(N-isopropylacrylamide) block copolymers synthesized by RAFT polymerization: micellization and gelation

Tang, T., Castelletto, V., Parras, P., Hamley, I.W., King, S.M., Roy, D., Perrier, S., Hoogenboom, R. and Schubert, U.S. (2006) Thermo-responsive poly(methyl methacrylate)-block-poly(N-isopropylacrylamide) block copolymers synthesized by RAFT polymerization: micellization and gelation. Macromolecular Chemistry and Physics, 207 (19). pp. 1718-1726. ISSN 1022-1352

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To link to this article DOI: 10.1002/macp.200600309

Abstract/Summary

RAFT polymerization was used to prepare PMMA-b-PNIPAM copolymers. Two different chain transfer agents, tBDB and MCPDB, were used to mediate the sequential polymerizations. Micellar solutions and gels were prepared from the resulting copolymers in aqueous solution. When heated above T-c of PNIPAM (about 31 degrees C), DLS revealed that PNIPAM coronas collapsed, resulting in aggregation of the original micelles. The micellar gels underwent syneresis above T-c as water was expelled from the ordered gel structure, the lattice periodicity of which was determined by SANS. A large decrease in lattice spacing was observed above T-c. The gel became more viscoelastic at high temperature, as revealed by shear rheometry which showed a large increase in G".

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Chemistry
ID Code:11653
Uncontrolled Keywords:diblock copolymer, gels, micelles, RAFT polymerization, thermoresponsive, FRAGMENTATION CHAIN TRANSFER, FREE-RADICAL POLYMERIZATION, FLUORESCENCE, SPECTROSCOPY, N-ISOPROPYLACRYLAMIDE, TRIBLOCK COPOLYMERS, DIBLOCK, COPOLYMERS, LIGHT-SCATTERING, MICELLES, POLY(N-ISOPROPYLACRYLAMIDE), GELS

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