Multifunctional Cu²⁺‐montmorillonite/epoxy resin nanocomposites with antibacterial activity

Abstract

Multifunctional nanocomposites can be achieved by addition of modified layered nanoclays to impart to the final materials a designed set of properties. The easy reproducible preparation of copper modified montmorillonite has been reported here together with its spectroscopic characterization, including 29Si NMR in the solid state. Epoxy-nanocomposites and glass fiber reinforced laminates containing 1% wt and 3% wt of Cu2+-MMT have been prepared and characterized. Thermal and mechanical properties have been evaluated. The experiments carried out to evaluate the antibacterial activity showed that the epoxy-resin nanocomposites with 3% wt of Cu2+-MMT exhibited an inhibition action higher than 96% against Escherichia coli and Staphylococcus aureus

Effect of a novel environmentally friendly additive of polyaspartic acid on the properties of urea formaldehyde resins/montmorillonite

“…FTIR spectra of Ca‐Mt, UF, and the modified UF composites are shown in Figure . For Ca‐Mt, two absorption bands around 3410 and 3630 cm −1 are attributed to stretching vibration of the OH groups . The band at about 1030 cm −1 is due to the stretching vibration of the SiO .…”

Multifunctional Epoxy/Nanocomposites Based on Natural Moroccan Clays with High Antimicrobial Activity: Morphological, Thermal and Mechanical Properties

“…The FTIR spectra ( Figure SI.1) resulted in being slightly modified with respect to the spectrum of the pristine epoxy resin (the strong absorptions of ν CCaromatic , ν CCOC , ν CN , and ν COC ethers and ν COC oxirane were present at 1508, 1239, 1104, 1032, and 827 cm -1 , respectively) along with an increased broad band at 3392 cm -1 of the OH stretching of Si-OH and Al-OH and of the hydroxyl groups present in the epoxy matrix [35,36]. Only in the case of EA4 was a broadening of the signal at 1450 cm -1 observed due to the presence of a strong and broad signal in A4 at 1430 cm -1 of calcite.…”

“…This section is aimed at describing the materials used in the experimental program, their preparation, and the methods used for the characterization of their mechanical and antimicrobial properties, which were carried out following the methods used in Ref. [35], where the antibacterial activity of multifunctional Cu 2+ -montmorillonite/epoxy resin nanocomposites was studied.…”

“…The point of intersection of the resulting curve with abscissa, at which pH = 0, gave the pH pzc . [53,54] and following the procedure previously described [35]. Each strain microbial testing was performed in triplicate: 6 specimens of neat epoxy resins were used as control (3 for t = 0 and 3 for t = 24 hours) and 3 samples of each nanocomposite were tested.…”

“…Recently, the antibacterial activity of polymer nanocomposites with different fillers has been studied. For instance, the addition of Na-montmorillonite in some composites, such as chitosan/P-VOH films, resulted in 40% growth inhibition of E.coli [33] while epoxy resin nanocomposites with copper-modified clays exhibited antibacterial activity against both Gram-negative and Gram-positive bacteria [34][35][36]. In general, this activity was found in nanocomposites containing modified clays with cationic systems [37] or metal ions such as copper [35] and silver [38,39].…”