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001     201061
005     20240619091137.0
024 7 _ |a 10.1021/ma300222d
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024 7 _ |a 0024-9297
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024 7 _ |a 1520-5835
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100 1 _ |a Popescu, Maria-Teodora
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245 _ _ |a Stimuli-Responsive Amphiphilic Polyelectrolyte Heptablock Copolymer Physical Hydrogels: An Unusual pH-Response
260 _ _ |a Washington, DC
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336 7 _ |a Journal Article
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520 _ _ |a An 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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700 1 _ |a Tsitsilianis, Constantinos
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700 1 _ |a Papadakis, Christine M.
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700 1 _ |a Adelsberger, Joseph
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700 1 _ |a Balog, Sandor
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700 1 _ |a Busch, Peter
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700 1 _ |a Hadjiantoniou, Natalie A.
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700 1 _ |a Patrickios, Costas S.
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773 _ _ |a 10.1021/ma300222d
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