title: Synthesis, evaluation and preliminary antibacterial testing of hybrid composites based on urethane oligodimethacrylates and Ag nanoparticles.
abstract: A series of urethane dimethacrylates differing structurally by the nature of the spacer (PTHF, PCL, PEG) and the presence or absence of the carboxylic acid groups was synthesized via an isocyanate route frequently encountered in ionomer chemistry. (1)H-NMR and FT-IR spectroscopy confirmed the structure of the macromers. Subsequently, the progress of photo-polymerization of all dimethacrylates under UV irradiation was investigated by FT-IR spectroscopy and photo-DSC with respect to conversion and polymerization rate using Irgacure as an initiator. The results of spectroscopic analysis suggested the lower reactivity of some non-carboxylic analogues during the formation of cross-linked polymers, the degree of conversion depending on the structure and viscosity. Photo-polymerization may provide many advantages for incorporating silver nanoparticles (2.5 wt%) into macromers in order to obtain hybrid nanocomposite films with controllable thickness and hydrophobicity. Combined analyses of UV spectroscopy and transmission electron microscopy confirmed the existence of nanosized silver (mean diameter 12 ± 0.7 nm) uniformly distributed in the polymer matrix. Preliminary results concerning the antibacterial activity of some composite films (thickness approx. 24 μm) showed that the obtained nanomaterial could have an excellent bactericidal effect and effectiveness in reducing bacterial growth (Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923).
authors: a Romanian Academy, Petru Poni Institute of Macromolecular Chemistry, 41 A Grigore Ghica Voda Alley, 700487 Iasi, Romania. tbur@icmpp.ro.
authors: Tinca
authors: T
authors: Buruiana
authors: Violeta
authors: V
authors: Melinte
authors: Andreea
authors: A
authors: Chibac
authors: Simona
authors: S
authors: Matiut
authors: Lavinia
authors: L
authors: Balan
mesh_terms: D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D004341:Drug Evaluation; D004926:Escherichia coli / Q000187:drug effects / Q000502:physiology; D053768:Metal Nanoparticles / Q000737:chemistry; D008689:Methacrylates / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D055668:Photochemical Processes; D058105:Polymerization; D011140:Polyurethanes / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D066244:Proton Magnetic Resonance Spectroscopy; D012834:Silver / Q000737:chemistry / Q000494:pharmacology*; D017550:Spectroscopy, Fourier Transform Infrared; D013211:Staphylococcus aureus / Q000187:drug effects / Q000502:physiology; D014783:Viscosity
chemical_list: D000900:Anti-Bacterial Agents; D008689:Methacrylates; D011140:Polyurethanes; C029824:urethane dimethacrylate luting resin; D012834:Silver