Application of polyurethane/gamma‐irradiated carbon nanotubes composites as antifouling coat

Abstract

The aim of this study is to avoid or reduce the risks of biofouling of ship hulls, using polyurethane/γ‐irradiated functionalized multiwall carbon nanotubes (PU/FMWCNT) nanocomposites as a coating for wood. These nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR) measurements, transmission electron microscopy (TEM), and field emission scanning electron microscopy (FESEM), and hardness, adhesion, and bending of the coated samples were examined. The antifouling ability of PU/γ‐irradiated FMWCNTs was studied by using an algae test. FTIR proved the presence of COOH group on the surface of MWCNT, while the FESEM results showed good dispersion of FMWCNT in polyurethane matrix. Mechanical properties of the coated wooden samples were improved; the samples showed good hardness and very good adhesion, and reasonable flexural modulus. The antifouling property of the coatings showed that 0.1 and 0.2 wt% FMWCNTs immobilized on polyurethane composite and irradiated for 100 kGy, were the most efficient antifouling coat when immersed in Chlorella vulgaris microalgae. POLYM. COMPOS., 39:E1196–E1207, 2018. © 2018 Society of Plastics Engineers

Mechanical Properties of Protective Coatings against Marine Fouling: A Review

“…The effect of fillers insertion in the polyurethane matrix was also investigated; nanocomposites based on ZnO and gamma-irradiated multiwall carbon nanotubes (MWCNT) mixed with polythiourethane or polyurethane, respectively, showed an increase of the mechanical properties in terms of tensile, hardness, and pull-off test results [ 56 , 57 ]. The presence of MWCNT led to the formation of a high degree of crosslinking and hydrogen bond between irradiated MWCNT and polyurethane chains obtaining an increase in the pencil hardness values up to highest value (7H) and improvement in adhesion strength up to highest value (5B).…”

Radioiodination of zearalenone and determination of Lactobacillus plantarum effect of on zearalenone organ distribution: In silico study and preclinical evaluation

“…3, which includes mycotoxins that are not classified as carcinogenic to humans [ 42 ]. The toxicity of ZEN in vivo was studied by many research mostly reported the hazardous effect of Zearalenone on the reproductive systems either in male or female [ 42 ], also there was a specific concern about the lipid peroxidation of membranes which is included in the means by which ZEN exert its toxic action on human [413, another concern was the findings of [ 44 ] who demonstrated the ability of Zearalenone to disrupt liver functions and affect the liver thoroughly to the degree of suppression of cytochrome P450 in the liver results of our work gave clear data about the distribution of Zearalenone in different body organs which in turn could reveal the most susceptible organs that could suffer from Zearalenone/derivatives toxicity [ [121] , [122] , [123] , [124] , [125] , [126] , [127] , [128] , [129] , [130] , [131] , [132] , [133] , [134] , [135] , [136] , [137] , [138] , [139] , [140] , [141] , [142] , [143] , [144] , [145] ]. By examining the beneficial effect of L. plantarum on the organ exposure to Zearalenone/derivatives, results revealed that although the administration of L. plantarum did not significantly alter the accumulation of [ 125 I]-iodo-ZEN in different mice organs and there were observed similarity in the pattern of Zearalenone distribution through different organs yet there was marked reduction in the Zearalenone concentration in the ovary and that was observed from the 1st 5 min of administration, and since the ovaries are considered the most sensitive (target) organ of Zearalenone toxicity that could provide additional benefit for the use of LAB as it was reported to demonstrate anti-inflammatory, anti-genotoxic and improve ovarian fertility [ 45 ], the decline in the accumulation of [ 125 I]iodo ZEN in mice organs may be attributed to the lactic acid bacterial capability to bind and/or alter ZEN to other compound [ 9 ].…”

Impact of graphene oxide nanoparticles and carbon black on the gamma radiation sensitization of acrylonitrile–butadiene rubber seal materials

“…The cross-linking density of polymer networks can be estimated by measuring the stress-strain response. [31] Table 3 shows the influence of the GO and GO/CB content and the radiation dose on the cross-linking density of the prepared rubbery nanocomposites. As can be seen, the cross-linking density increased as the GO content increased to 3 phr, and then it declined at a constant rate until reaching a GO content of 7 phr.…”