Selective depolymerization and upcycling of thermoset polyurethane: From waste foam to easily-degradable flame-retardant film - Kaiming Du; Huiwen He; Zongsheng Liu; Hang Hu; Junguang Zhou; Wenrui Song; Ming Lu; Lingxiao Cui; Meng Ma; Yanqin Shi; Yulu Zhu; Si Chen; et al. (Chemical Engineering Journal, 2026)