Simultaneous photoinduced electron transfer and photoinduced CuAAC processes for antibacterial thermosets

Abstract

A combination of simultaneous photoinduced electron transfer and photoinduced CuAAC processes enables the in-situ preparation of antibacterial thermosets containing silver nanoparticles (AgNPs) in one-pot. Upon photolysis of photoinitator, the generated radicals not only reduce Cu(II) into Cu(I) activator to catalyst the CuAAC click reaction, but also simultaneously generate AgNPs from AgNO 3 through electron transfer reaction. Due to their reduction potentials difference, the polymer matrix is formed before the formation of AgNPs, assisting to eliminate the agglomeration of them. The thermoset structures are confirmed by FT-IR and solubility tests, whereas the presence of AgNPs is proven by transmission electron microscopy with energy dispersive X-ray system analyzer. The samples containing 5 and 10% AgNPs exhibited strong inhibition zones, where all kinds of bacteria (gram-positive (Staphylococcus Aureus) and gram-negative (Escherichia Coli)) were killed in the surrounding of the film samples.

Polymer Nanocomposites via Click Chemistry Reactions

“…The strategy of anchoring azide functional ligand onto nanoparticle surface was also exemplified in development of fluorescent polyurethane-ZnO hybrid nanocomposite coatings [ 28 ]. In a recent study, antibacterial thermoset nanocomposites containing silver NPs was successfully prepared by combination of simultaneous photoinduced electron transfer and CuAAC processes [ 29 ]. The photogenerated radicals not only reduce Cu(II) into Cu(I) activator to catalyst the CuAAC click reaction between multifunctional azide and alkyne molecules, but also they were simultaneously oxidized by silver(II) nitrate to generate silver NPs.…”

Contributions of photochemistry to bio-based antibacterial polymer materials

“…Finally, a one-step process can also be implemented, by taking advantage of the light irradiation of photopolymerization to simultaneously form in situ the NPs by photoreduction of a metal salt [125][126][127][128][129][130] .…”

The Use of Click-Type Reactions in the Preparation of Thermosets

“…In their paper, Tasdelen et al described the preparation of antibacterial thermosets by combining simultaneous photoinduced electron transfer and photoinduced CuAAC processes [147]. The radicals, photochemically generated from DMPA, not only help to form Ag 0 nanoparticles from Ag + cation, but also reduce Cu (II) into Cu (I), which catalyze the CuAAC of multifunctional azide and alkyne compounds.…”