“…7,8 Still, PUs have also some drawbacks, such as poor solvents resistance and low biodegradability, which greatly limits their application in certain areas. 9 According to the literature, one of the most often applied manner to eliminate these drawbacks of PUs is the addition of various inorganic oxides, 10,11 clays, 12,13 organic compounds, 14 hybrid materials, 15,16 cellulose, 17 various carbon fillers, 18 and so on. In this way, it is possible to improve thermal, mechanical, electrical, magnetic, optical, anticorrosive, antibacterial, photocatalytic, and gas barrier properties of such PUs.…”