Temperature-Induced Ordering and Gelation of Star Micelles Based on ABA Triblocks Synthesized Via Aqueous RAFT Polymerization
Polymers and High Performance Materials
The reversible formation of ordered physical gels from stimuli-responsive ABA [A poly(N,N-dimethylacrylamide) (PDMA), B = poly(N-isopropylacrylamide) (PNIPAM)] triblock copolymers is investigated utilizing dynamic light scattering, small angle X-ray scattering, and low-shear rheometry. As the temperature is increased above the phase transition temperature of the PNIPAM segment, triblock copolymers under a critical molecular weight are capable of packing into body-centered cubic arrays. Rheometric tests indicate that the storage moduli of the gels at 50 degrees C are inversely related to the molecular weight of the polymer.
McCormick, C. L.
(2009). Temperature-Induced Ordering and Gelation of Star Micelles Based on ABA Triblocks Synthesized Via Aqueous RAFT Polymerization. Soft Matter, 5(11), 2179-2182.
Available at: http://aquila.usm.edu/fac_pubs/1173