Avans University of Applied Science 1 article published in JoVE Chemistry Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer Dennis Molendijk1, Koen van Beurden1, Jack van Schijndel1 1Research Group Green Chemistry, Avans University of Applied Science An example of a closed-loop approach towards a circular materials economy is described here. A whole sustainable cycle is presented where biobased semi-aromatic polyesters are designed by polymerization, depolymerization, and then re-polymerized with only slight changes in their yields or final properties.