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000201061 1001_ $$0P:(DE-HGF)0$$aPopescu, Maria-Teodora$$b0$$eCorresponding Author
000201061 245__ $$aStimuli-Responsive Amphiphilic Polyelectrolyte Heptablock Copolymer Physical Hydrogels: An Unusual pH-Response
000201061 260__ $$aWashington, DC$$bSoc.$$c2012
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000201061 520__ $$aAn amphiphilic cationic polyelectrolyte based on poly[2-(dimethylamino)ethyl methacrylate] (polyDMA) and poly(n-butyl methacrylate) (polyBuMA) with a BuMA–DMA–BuMA–DMA–BuMA–DMA–BuMA heptablock copolymer architecture was studied in aqueous media. This copolymer was found to form a physical hydrogel via the intermolecular hydrophobic association (physical cross-linking) of the BuMA blocks. The rheological properties of the heptablock hydrogels were investigated as a function of copolymer concentration, and pH. The results showed a peculiar pH-dependence of the rheological properties, remarkably different from those observed with associative telechelic polyelectrolytes. Aqueous solutions of this copolymer were free-flowing sols at low pH (below 2) and high pH (above 8), whereas they turned into gels at intermediate pH values. The rheological properties studied as a function of pH showed two additional stiff–soft–stiff gel transitions at pH 4.5 and 6.5. Small-angle neutron scattering revealed the formation of a 3D transient network of bridged flower-like micelles whose structural characteristics, i.e., micellar radius, hard-sphere radius and hard-sphere volume fraction, were smoothly evolving with the pD.
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000201061 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x2
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000201061 65017 $$0V:(DE-MLZ)GC-140$$2V:(DE-HGF)$$aSoft Matter, Macromolecules, Complex fluids, Biophysics $$x0
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000201061 7001_ $$0P:(DE-HGF)0$$aTsitsilianis, Constantinos$$b1
000201061 7001_ $$0P:(DE-HGF)0$$aPapadakis, Christine M.$$b2
000201061 7001_ $$0P:(DE-HGF)0$$aAdelsberger, Joseph$$b3
000201061 7001_ $$0P:(DE-HGF)0$$aBalog, Sandor$$b4
000201061 7001_ $$0P:(DE-HGF)0$$aBusch, Peter$$b5
000201061 7001_ $$0P:(DE-HGF)0$$aHadjiantoniou, Natalie A.$$b6
000201061 7001_ $$0P:(DE-HGF)0$$aPatrickios, Costas S.$$b7
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