Ulf W. Gedde is professor emeritus of Polymeric Materials at KTH Royal Institute of Technology. He is the author of 300 scientific papers and three textbooks: Polymer Physics (1995), Fundamental Polymer Science (2019; together with Mikael  S. Hedenqvist) and Essential Classical Thermodynamics (2020). Gedde is also Editor of Polymer Testing.   Mikael S. Hedenqvist is professor and head of the Division of Polymeric Materials, Fibre and Polymer Technology, KTH Royal Institute of Technology.  He is  the author of  260 scientific papers, 9 book chapters and one textbook: Fundamental Polymer Science (2019; together with Ulf W. Gedde). He is serving as Editor of Polymer Testing.   Minna Hakkarainen is professor in Polymer Technology and head of the Division of Polymer Technology, Fibre and Polymer Technology, KTH Royal Institute of Technology.  She is  the author of  180 scientific papers, 7 book chapters and one book: Update on polylactide based materials (together with Anna Finne-Wistrand).    Fritjof Nilsson is associate professor (docent) and researcher in the Division of Polymeric Materials, Fibre and Polymer Technology, KTH Royal Institute of Technology. He is the author of 45 scientific papers.    Oisik Das is a researcher/assistant professor affiliated to Luleå University of Technology, Sweden and Nanjing University of Science and Technology, China. He is the author of 50 scientific articles, 5 book chapters and 2 editorials. He is serving as an editorial board member of Polymer Testing, Polymers and Materials Circular Economy.