Antimicrobial activity of acrylic polyurethane/Fe3O4-Ag nanocomposite coating (original) (raw)
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Progress in Organic Coatings, 2019
In this paper, an antibacterial nanocomposite coating has been prepared by a green method based on photocroslinking with the addition of new synthesized Fe 3 O 4-Ag nanohybrids. Fe 3 O 4-Ag hybrid nanoparticles (0.1 wt. %) were dispersed in UV-curable acrylate resin stystem (BGDM and HDDA). The kinetic of UV-curing reaction of the nanocomposite was studited by measuring the coversion of acrylate double bonds, the variation of relative hardness, gel fraction and swelling degree of the coating. The structural morphology, mechanical and antibacterial properties of the nanocomposite were characterized. The analysis data demonstrated that the addition of 0.1 wt.% of Fe 3 O 4-Ag hybrid nanoparticles into the coating affected insignificantly to its crosslinking process; the UV-exposure time to achieve a full crosslinking coating was about 4.8 s; the hybrid nanoparticles were homogeneously dispersed in network polymer matrix. The addition of the nanohybrids into the UV curing coating improved its its abrasion resistance from 98.24 to 126.54 lite/mil. The antibacterial testing indicated that the antimicrobial activity of the nanocomposite against E. coli was inversely proportional to its crosslinking density. Adding the nanocomposite in the culture, the growth rate of culture reduced about 3-5 % compared to that of the pure culture, after 5 h of cultivation while no antibacterial activity was observed for the neat coating.
Recent advance in antibacterial activity of nanoparticles contained polyurethane
Journal of Applied Polymer Science, 2018
Polyurethanes (PUs) are among the most widely used polymers with various applications in several industries. Antibacterial activity is an important feature of PU materials used in medical or many other related consumer products. They can, however, be easily colonized by bacteria and fungi, which may cause many problems for human health. It is therefore very important to enhance the antimicrobial properties of PUs, besides improving their chemical and physical properties. The incorporation of some antibacterial materials in the PUs' polymeric matrices is an effective strategy to improve their antibacterial activity. In this regard, the addition of some materials including Ag, Au, ZnO, and TiO 2 nanoparticles, carbon nanotubes and chitosan to the PUs' material structure is reviewed in this article, and their antibacterial mechanisms are discussed.
Polyurethane-Based Coatings with Promising Antibacterial Properties
Materials
In coatings technology, the possibility of introducing specific characteristics at the surface level allows for the manufacture of medical devices with efficient and prolonged antibacterial properties. This efficiency is often achieved by the use of a small amount of antibacterial molecules, which can fulfil their duty while limiting eventual releasing problems. The object of this work was the preparation and characterization of silver, titanium dioxide and chitosan polyurethane-based coatings. Coatings with the three antibacterials were prepared using different deposition techniques, using a brush or a bar coater automatic film applicator, and compared to solvent casted films prepared with the same components. For silver containing materials, an innovative strategy contemplating the use and preparation of silver nanoparticles in a single step-method was employed. This preparation was obtained starting from a silver precursor and using a single compound as the reducing agent and sta...
Development of bacterially resistant polyurethane for coating medical devices
Biomedical Materials, 2012
Polyurethanes have been widely used in medicine for coating and packaging implantable and other medical devices. Polyether-urethanes, in particular, have superior mechanical properties and are biocompatible, but in common with other medical materials they are susceptible to microbial film formation. In this study, polyether-urethane was end-capped with silver lactate and silver sulfadiazine functional groups to produce a bacterially resistant polymer without sacrificing the useful mechanical properties of the polyether-polyurethane. The silver ions were covalently incorporated into the polymer during chain extension of the prepolymer. The functionalized polymers were structurally characterized by light scattering, electron microscopy, NMR, FTIR and Raman spectroscopy. Mechanical properties, hydrophilicity, in vitro stability and antibacterial action of polymers were also investigated. Results indicate that both silver salts were successfully incorporated into the polymer structure without significant effect on mechanical properties, whilst conferring acceptable bacterial resistance.
Journal of nanostructure in chemistry, 2018
In this study, a facile method for the production of Antibacterial and Antistatic polyurethane coatings was investigated using copper modified ZnO nanoparticles-polyaniline nanofibers (PANI-CuZnO) ternary nanocomposite. PANI-CuZnO ternary nanocomposite was synthesized through two steps. First, copper-modified ZnO nanoparticles were produced through the hydrolysis method using acetate precursors, and then they were mixed with polyaniline nanofibers, which were synthesized by seeding method. The obtained nanocomposite was characterized by FTIR, XRD, and FESEM techniques. Results of evaluating the antibacterial action of the polyurethane coatings with the content of ternary nanocomposite showed that the obtained coatings have a proper antibacterial action against Gram-positive and Gram-negative bacteria. In addition, measuring the coatings' surface electrical resistance revealed that addition of the ternary nanocomposite to the polyurethane coatings' matrix causes the surface electrical resistance of the coatings significantly decreases and reaches 8 × 10 7 Ω/sq. Thereby, they could be categorized as an antistatic coating. Moreover, the addition of PANI-CuZnO enhanced adhesion strength and scratch resistance of the final polyurethane coatings.
Journal of Biomaterials Science, Polymer Edition, 2012
A series of urethane dimethacrylates differing stnrcturally 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. t H-NMR and FT-IR spectroscopy confirmed the structure of the macromers. Subsequently, the progress ofphoto-polymerization ofall dimethacrylateS under UV irradiation was investigated by FT-IR specroscopy 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 crosslinked polymers, the degree of conversion depending on the structure and viscosity. Fhoto-polymerization may provide many advantages for incorporating silver nanoparticles (2.5 wLVo) inlo macromers in order to obtain hybrid nanocomposite films with controllable thickness and hydrophobicity. Combined analyses of UV spectroscopy and transmission elecfon microscopy confirmed the existence of nanosized silver (mean diameter 12 +03 nm) uniformly distributed in the polymer matdx. Preliminary results concerning the antibacterial activity of some composite films (thickness approx.24 Fm) showed that rhe obtained nanomaterial could have an excellent bactericidal effect and effectiveness in reducing bacterial Erowth'{Escherichia coli NICC 25922, Staphylococcus aureus Ntcc25923). @ Koninklijke Brill NV, Leiden,2Ol2 q Keywords Urethane dimethacrylate, photo-polymerization, silver nanocomposite, biocidal effect
Plant oil polyol nanocomposite for antibacterial polyurethane coating
Progress in Organic Coatings, 2013
a b s t r a c t Some preliminary investigations on "green" preparation, morphology and antibacterial behavior of Linseed polyol nanocomposite [LMPOL] for antibacterial polyurethane coatings are summarised. Nanocomposite is prepared in situ with Linseed polyol [LP] matrix as organic and Copper acetate as inorganic constituent by "solventless one-pot" chemical reaction. The presence of characteristic absorption bands in FTIR spectra confirmed the formation of LMPOL. TEM analysis showed the presence of nanosized metal oxide in LMPOL. LMPOL showed good antibacterial behavior against E. coli and S. aureus. The interactions between LMPOL and bacterial surfaces lead to good antibacterial efficacy, suggesting membrane disruption based cell death. LMPOL may serve as an excellent starting material for antibacterial polyurethane coating. The approach is an excellent example for the preparation of "green" polyol from "green" resource en route Green Chemistry for protective polyurethane coatings.
Ultra-Thin Films of Poly(acrylic acid)/Silver Nanocomposite Coatings for Antimicrobial Applications
Journal of Spectroscopy, 2016
In this work not only colloids of poly(acrylic acid) (PAA) embedded with silver nanoparticles (Ag-NPs) but thin films (10 nm) also were deposited using electrospray deposition technique (ESD). A mixture of sodium borohydride (NaBH4) and ascorbic acid (AA) were utilized to reduce the silver ions to generate Ag-NPs in the PAA matrix. Moreover, sodium tricitrate was used to stabilize the prepared colloids. The obtained colloids and films were characterized using UV-visible, transmission electron microscopy (TEM). UV-Vis results reveal that an absorption peak at 425 nm was observed in presence of PAA-AgNO3-AA-citrate-NaBH4. This peak is attributed to the well-known surface plasmon resonance of the silver bound in Ag-NPs, while the reduction was rendering and/or inhibiting in absence of the AA and citrate. FTIR spectroscopy was used to study the mechanism of the reaction process of silver nitrate with PAA. TEM images showed the well dispersion of Ag-NPs in the PAA matrix with average par...
Antimicrobial, Mechanical and Thermal Studies of Silver Particle-Loaded Polyurethane
Journal of Functional Biomaterials, 2013
Silver-particle-incorporated polyurethane films were evaluated for antimicrobial activity towards two different bacteria: Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). Distributed silver particles sourced from silver nitrate, silver lactate and preformed silver nanoparticles were mixed with polyurethane (PU) and variously characterized by field emission scanning electron microscopy (FESEM), fourier transform infra-red (FTIR) spectroscopy, X-ray diffraction (XRD) and contact angle measurement. Antibacterial activity against E.coli was confirmed for films loaded with 10% (w/w) AgNO 3 , 1% and 10% (w/w) Ag lactate and preformed Ag nanoparticles. All were active against S. aureus, but Ag nanoparticles loaded with PU had a minor effect. The apparent antibacterial performance of Ag lactate-loaded PU is better than other Ag ion-loaded films, revealed from the zone of inhibition study. The better performance of silver lactate-loaded PU was the likely result of a porous PU structure. FESEM and FTIR indicated direct interaction of silver with the PU backbone, and XRD patterns confirmed that face-centred cubic-type silver, representative of Ag metal, was present. Young's modulus, tensile strength and the hardness of silver containing PU films were not adversely affected and possibly marginally increased with silver incorporation. Dynamic mechanical analysis (DMA) indicated greater thermal stability.
Preparation of Polymer Nanocomposites with Enhanced Antimicrobial Properties
Plasma surface activation and antibacterial properties of nanocomposites of polypropylene/silver nanoparticles (PP/nAg) and nylon-6/silver nanoparticles (Ny6/nAg) were investigated. The nanocomposites were prepared by melt blending assisted by ultrasound, while surface activation was achieved by means of argon plasma. To evaluate the antimicrobial properties of the nanocomposites, pathogen microorganisms such as Pseudomonas aeruginosa and Aspergillus niger were tested. Scanning Electron Microscopy (SEM) analyses showed a uniform dispersion of nanoparticles within the polymer matrix, though the presence of some agglomerates was also appreciated. On the other hand, surface topography by Atomic Force Microscopy (AFM) suggested that ions from the argon plasma generated ion collisions with the surface of the nanocomposites removing or etching polymer from surface and improving silver nanoparticles exposure, increasing their antimicrobial properties as corroborated by antimicrobial analyses. Nanocomposites exposed to argon plasma presented higher antimicrobial properties than the ones not exposed. These results indicated that plasma treatment increased the contact area of the nanoparticles with the microorganisms and enhanced the antimicrobial properties of nanocomposites. The results also showed that PP/nAg nanocomposites presented higher bacterial inhibition than Ny6/nAg nanocomposites, indicating that the chemical structure of the polymer also plays a big role in the final performance of the composite.