Stabilization in Water of Polymer/Cu²⁺ Complexes Using Poly(sodium acrylate)‐graft‐poly(N,N‐dimethylacrylamide) Graft Copolymers

Abstract

The formation of complexes between Cu2+ ions and graft copolymers built from a PANa backbone and non‐ionic hydrophilic PDMAM side chains is investigated by means of turbidimetry, viscometry, DLS, ζ‐potential measurements, and UV‐vis spectrophotometry. The macroscopic phase separation which accompanies complexation is gradually depressed with increasing PDMAM content x, and water‐soluble complexes are formed for x = 70 mol‐%. The polymer/Cu2+ complexation is a charge neutralization process that leads to the formation of water‐soluble, compact, hybrid polymer/metal ion nanostructures. UV‐vis data indicate that this graft copolymer could possibly serve as a water‐soluble sensor for Cu2+ ions.

Effects of antimicrobial agents on the thermal and mechanical properties of acrylate hydrogel matrices

“…These observations are consistent with the DMTA and densities results; they confirm the aggregation effects on the T g and the storage modulus …”

Temperature-Sensitive Water-Soluble Hybrid Organic/Inorganic Nanoparticles Formed through Complexation of Cu2+ Ions with Poly(sodium acrylate)-g-poly(N-isopropylacrylamide) Comb-Type Copolymers in Aqueous Solution

“…Recently, a major goal of our research efforts is the improvement of the solubility of coordination complexes formed between bivalent metal ions, such as Cu 2+ ions, and carboxyl-containing polymers in aqueous solution. As known, the complexation of Cu 2+ ions with neutralized carboxyl-containing polymers, such as polyacrylates or polymethacrylates, leads to phase separation when the net charge of the polymer chain is sufficiently decreased. − However, it was demonstrated that phase separation may be avoided if the polyacrylate chain is decorated with a sufficient number of pendant hydrophilic nonionic poly( N , N -dimethylacrylamide) (PDMAM) side chains, i.e., using adequate PANa-g-PDMAM comb-type copolymers. Thus, when such copolymers are used, core−corona hybrid organic/inorganic nanoparticles are formed upon addition of Cu 2+ ions into the aqueous polymer solution, where the PANa/Cu 2+ complex generates the water-insoluble core, sterically stabilized in water by the hydrophilic PDMAM corona.…”