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.
Molendijk, D., van Beurden, K., van Schijndel, J. Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer. J. Vis. Exp. (165), e61975, doi:10.3791/61975 (2020).