“…For example, Nylon 6 and its derivatives are some of the most comprehensively used construction materials in a number of industries including the automotive industry, clothing industry, aircraft industry, and chemical industry. , It is currently produced by most of the leading chemical companies including BASF, Radici, and DOMO, with an annual global total production of over 4 million tonnes . Polyacrylonitrile (PAN) is a commercial product, which is predominantly used as a precursor for carbon fiber manufacture with global market demand of $6.3 billion in 2018. , Other nitrogen-containing polymers, e.g., urea-formaldehyde (UF), have also found their applications in the forest industry and agricultural industry. , …”