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Persistent URL http://purl.org/net/epubs/work/37302
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Record Id 37302
Title Thermo-responsive poly(methyl methacrylate)-b-poly(N-isopropyl acrylamide) Block Copolymers Synthesised by RAFT Polymerisation: Micellisation and Gelation
Abstract 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 Tc of PNIPAM (about 31 °C), DLS revealed that PNIPAM coronas collapsed, resulting in aggregation of the original micelles. The micellar gels underwent syneresis above Tc 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 Tc. The gel became more viscoelastic at high temperature, as revealed by shear rheometry which showed a large increase in G.
Organisation CCLRC , ISIS , ISIS-LOQ
Keywords Materials , Chemistry , RAFT polymerization , gels , thermoresponsive , diblock copolymer , micelles , ISIS 2007
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Macromol Chem Phys (2006): 1718-1726. http://dx.doi.org….1002/macp.200600309 2006