جستجوی مقالات مرتبط با کلیدواژه "نانو اوره" در نشریات گروه "شیمی"

Due to the development of nanotechnology and its expansion in industries such as textiles, agriculture, etc., and considering that nanotechnology increases the speed of reactions and reduces the consumption of chemicals and improves environmental conditions, so in this study nano urea synthesis methods in polyester substrate and preparation methods and properties created in this textile were used as other textiles and geotextiles. In this study, in order to synthesize nano-urea, we first ground samples of urea with the help of a mill and impregnated it on a polyester textile bed. The results show that increasing the concentration and grinding time is effective in the solution removal Increasing the concentration of the solution and increasing the grinding time of the samples have a positive effect on the urea uptake by the product and there is a significant difference between the samples and the dimensional parameters are done using the mill and examined at different times. Prepared with concentrations of 1500-500 ppm and applied it under different conditions on non-woven polyester fabric by pad-dry-cure method and dried at room temperature. Finally, additional FTIR-UV-AA tests and flexural strength tests were performed on the samples. UV and AA tests also show that by reducing the size and concentration of urea, the amount of urea absorbed by the fabric increases and as an agar textile causes urea to remain in the soil longer and tolerate the time of uptake by the plant. Bending of the sample, increasing the concentration in the samples indicates that the thickness of the synthesized urea has increased and due to the amorphous structure of the film, it has increased the flexibility, which is different in the length and width of the fabric, which indicates structural changes. The fabric is nonwoven. The results of FT-IR test of the samples show that the functional groups of the polyester spectrum are somewhat displaced in the presence of urea. Which indicates the binding of NH2 urea groups with polyester fiber, which indicates the reaction between them, and the strength test shows that to the point of rupture and elongation, it was found that increasing the concentration of urea in the process greatly increases the elasticity. And increases the length to the point of rupture to the extent that it shows an improvement of 6-8%, but reduces the tensile strength due to the formation of a fiber bond Conclusion Non-woven polyester textile sample with nano urea synthesis by comparing the absorption wavelength of urea in different concentrations on the non-woven polyester substrate indicates that it leads to a change in the absorption wavelength and urea is placed in the fiber bed and decreases the concentration. The wavelength is closer to the nano range and due to the amorphous structure of the film, it has increased the flexibility, which is different in the length and width of the fabric, which is a sign of structural changes in the nonwovens.