Ultra-strength Polyurethane/MOF-deriver Composites for Self-Healing, and Recycling Capabilities and Highly Efficient Microwave Absorption

The development of multifunctional electromagnetic waves (EMW) absorption materials has significance for addressing the hazards posed by EMW. Herein, we designed a polyurethane-based EMW absorption materials (P6H7-B3¬O3-CoNC@rGo6%) with high strength, self-healing and high-efficiency EMW absorption ability properties. The P6H7-B3¬O3-CoNC@rGo6% has excellent EMW absorption performance with RLmin of -47.1 dB at 12.8 GHz and the EAB is 4.11 GHz at 2 mm thickness as well as a very low filler mass loading of only 6 wt%. The polyurethane (P6H7-B3¬O3) and the nanocomposites (P6H7-B3¬O3-CoNC@rGo6%) exhibit excellent mechanical property with 62.79 MPa and 22.04 MPa, respectively. Additionally, the P6H7-B3¬O3-CoNC@rGo6% can rapidly restore to its original state at 85 oC by the ester exchange reaction of boron ester bond. This strategy provides a new idea for designing polyurethane-based EMW absorption materials and extending service life of EMW absorption materials.