“…Polyurethanes (PUR) are a special family of materials with a variety of uses, including coatings, adhesives, elastomers, sealants, films, flexible, semi-rigid, and rigid foams [ 9 ]. Polyurethane foams are the most versatile products, being highly used in different applications depending on their morphology and mechanical properties as flexible, semi-rigid, or rigid foams [ 9 , 10 ]. PUR foam flexible products account for up to 65 % of the foam market being mostly used as mattresses in furniture industry, while the rigid version is used mostly as thermal insulating material in construction field [ 11 ].…”