Effect of silver nanoparticle on the properties of poly(methyl methacrylate) nanocomposite network made by in situ photoiniferter-mediated photopolymerization

Abstract

Here we report preparation and characterization of poly(methyl methacrylate)/silver nanoparticles (PMMA/AgNPs) nanocomposite networks prepared via in situ photoiniferter-mediated photopolymerization (in situ PMP) using tetraethylthiuram disulphide (TED) as photoiniferter and 2,2-dimethoxy-2-phenylacetophenone (DMPA) as photoinitiator. Photopolymerization was performed in the presence of allyl methacrylate, as crosslinking agent, and various amount of silver nanoparticles (AgNPs). AgNPs were synthesized via chemical reduction of silver nitrate with t-BuONa-activated sodium hydride in tetrahydrofuran. The degree of monomer conversion (DC%) during polymerization was followed quantitatively via Fourier transform infrared spectroscopy. DC% of nanocomposite networks slightly increased with AgNPs content. Moreover, differential scanning calorimetry results disclosed a decrease in glass transition temperature (T g ) of the nanocomposite networks in comparison with the pure polymer network, suggesting the plasticizing effect of AgNPs. Swelling behaviour was also measured in water and ethanol/water (3/1, v/v) solution at 37 ± 1 • C after 30 days. The enhanced swelling ratio for nanocomposite networks with increase in the AgNPs content suggested the potential role of AgNPs in photo-crosslinking reactions. The flexural strength and modulus values resulted from three-point bending method revealed an improvement in mechanical properties of the nanocomposites in comparison with pure PMMA networks. The mechanical behaviour observations were rationalized based on the field emission scanning electron microscopy micrographs from the fractured surfaces of the nanocomposite networks. Finally, thermogravimetric analysis showed that while the AgNPs catalyse the degradation in the early stages, they subsequently act as a retardant agent against thermal degradation.

Metal‐Based Nanomaterials in Biomedical Applications: Antimicrobial Activity and Cytotoxicity Aspects

“…[ 147–149 ] Silver nanostructures display potent antimicrobial activities that are comparable with Ag ions. [ 150 ] Silver and silver oxide (Ag 2 O) nanoparticles have diverse antibacterial applications in dentistry, [ 105,111,151 ] as scaffolds for tissue engineering [ 152,153 ] and as wound healing materials. [ 154,155 ] They have also been used as antimicrobial materials in other industries including food packaging, [ 156,157 ] drinking water disinfection, [ 158 ] and textile manufacturing.…”

Solubility, ductility and resilience of a PMMA denture resin with graphene and silver nanoparticles addition

“…Inorganic nanofillers have a large surface area which determines a high surface energy at the interface of polymer matrix, improving flexural strength; they improve hardness due to their rigidity and higher stiffness than the matrix [4] and the fracture toughness as well, because of the more uniform distribution compared to micro fillers [5]. Addition of silver nanoparticles to PMMA has several favorable effects: antimicrobial activity, increased monomer conversion, increased flexural strength and elastic modulus, improved thermal stability [6]. Tripathy showed that graphene oxide incorporation into PMMA determines improved mechanicaltensile strength, Young's modulus, strain at break, thermal and electrical properties of the material [7].…”

Antimicrobial modified hydroxyapatite composite dental bite by stereolithography

“…[14][15][16] In this work, a novel use of SLA for dental application is proposed with the aim to develop a composite occlusal bite with improved mechanical properties and antimicrobial capability. In particular, HAPfilled resin was modified with methacrylate and quaternary ammonium compound, [17][18][19] in order to provide increased adhesion of the filler with the polymer matrix and antimicrobial properties at the same time.…”