Abstract
Polyacrylate polymer (PA) was modified with graphene oxide (GO) and the obtained composites were applied as coatings for controlled-release coated urea (CRU). The physicochemical properties of the different PA/GO coatings were characterized in detail and the nitrogen-release characteristics of the obtained CRU samples were determined in water at 25 °C. The experimental results revealed that addition of GO to PA reduced the swelling degree from 83.01% to 46.35% and improved its mechanical properties (the Young’s modulus was improved from 31.52 to 34.97 MPa and the glass transition temperature was increased from 4.21 to 6.11 °C), thus dramatically slowing down the cumulative nutrient release from the CRU fertilizer from 87.25% to 59.71%. These results suggest that GO enhances the properties of PA for CRU applications, which shows that GO-modified PA is a good coating material.
Highlights
With the rapid population growth, the demand for grain production has raised significantly.In order to satisfy the food needs of our ever-growing population, the development of modern mechanical agriculture techniques and the extensive use of chemical fertilizers and pesticides are key
By comparing the two different dispersions, one can observe the differences in color with the increasing amount of graphene oxide (GO)
The dispersion 1 observe the differences in color with the increasing amount of GO
Summary
With the rapid population growth, the demand for grain production has raised significantly. In order to satisfy the food needs of our ever-growing population, the development of modern mechanical agriculture techniques and the extensive use of chemical fertilizers and pesticides are key. Fan and Pardey [1] have suggested that 21.7% of the agriculture production growth in China from 1965 to 1993 resulted from the increasing use of fertilizers. Because of the low use efficiency of N and the maximum use of nitrogen fertilizer, the use of urea poses a dilemma. To increase the efficient use of urea and minimize its negative impact on the environment, controlled-release fertilizers have been proposed as one of the solutions [8,9]
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