Cover Feature: Aromatic Poly(dithioacetal)s: Spanning Degradability, Thermostability, and High Refractive Index Towards Eco‐friendly Optics (ChemSusChem 1/2025)

The Cover Feature shows aromatic poly(dithioacetal)s, which are multifunctional materials for eco‐friendly optics with a high refractive index (>1.7), visible transparency, thermal stability, on‐demand degradability, and recyclability. Cyclic low‐molecular‐weight products from zinc‐catalyzed polymer degradation lead to acid‐catalyzed repolymerization to the raw polymer, representing a closed‐loop recycling process without any deterioration in the optical properties. More information can be found in the Research Article by K. Oyaizu and co‐workers.