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We present a novel approach for the preparation of polymer-TiO₂ composite microgels. These microgels were prepared by the in situ hydrolysis and condensation of titanium tetrabutoxide (TBOT) in a mixed ethanol/acetonitrile solvent system, using poly(styrene- co - N -isopropylacrylamide)/poly( N -isopropylacrylamide- co -methacrylic acid) (P(St-NIPAM/P(NIPAM- co -MAA)) as the core component. Silver nanoparticles (AgNPs) were controllably loaded onto the polymer-TiO₂ composite microgels through the reduction of an ammoniacal silver solution in ethanol catalyzed by NaOH. The results showed that the P(St-NIPAM)/P(NIPAM- co -MAA)-TiO₂ (polymer-TiO₂) organic-inorganic composite microgels were less thermally sensitive than the polymer gels themselves, owing to rigid O⁻Ti⁻O chains introduced into the three-dimensional framework of the polymer microgels. The sizes of the AgNPs and their loading amount were controlled by adjusting the initial concentration of [Ag(NH₃)₂]⁺. The surface plasmon resonance (SPR) band of the P(St-NIPAM)/P(NIPAM- co -MAA)-TiO₂/Ag (polymer-TiO₂/Ag) composite microgels can be tuned by changing the temperature of the environment. The catalytic activities of the polymer-TiO₂/Ag composite microgels were investigated in the NaBH₄ reduction of 4-nitrophenol. It was demonstrated that the organic-inorganic network chains of the polymer microgels not only favor the mass transfer of the reactant but can also modulate the catalytic activities of the AgNPs by tuning the temperature.

Synthesis of Silver Nanoparticles Loaded onto Polymer-Inorganic Composite Materials and Their Regulated Catalytic Activity