Closed-loop recyclable and biodegradable thioester-based covalent adaptable networks

Closed-loop recyclable and biodegradable aliphatic covalent adaptable networks (CANs) based on dynamic beta-CO thioester linkages that exhibit a service temperature beyond 100 degrees C are reported. These CANs possessing tensile strength and modulus values of up to 0.3 and 3 MPa, respectively, effectively undergo stress relaxation above 100 degrees C. The samples exhibit creep resistance ability and low hysteresis loss, and are repeatedly reprocessable at 120 degrees C. These CANs are depolymerizable to monomers under mild conditions and lose notable mechanical strength (92.4%) and weight (76.5%) within similar to 35 days under natural biodegradation conditions.