Journal
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
Volume 529, Issue -, Pages 60-70Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15421406.2010.495899
Keywords
Azobenzene; liquid-crystalline molecules; reversible addition-fragmentation chain transfer (RAFT) polymerization; telechelic poly(N-isopropylacrylamide)
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A telechelic poly(N-isopropylacrylamide) (PNIPAM) with azobenzene end-groups (telechelic Az-PNIPAM) was prepared by reversible addition-fragmentation chain transfer (RAFT) free radical polymerization of NIPAM. This polymer self-assembles in cold water forming nanoparticles with a hydrodynamic radius (RH) of 8nm and an aggregation number of 29 chains. The thermoresponsive behavior of Az-PNIPAM in water was investigated by turbidimetry and light scattering. In addition, the photoresponsive behavior of aqueous Az-PNIPAM was investigated by monitoring the changes with temperature of the solution and transmittance at 650nm before and after irradiation at 366nm.
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