Bio-Based Vitrimer Foam of Bis-Glycidyl Dehydroabietylamine/Epoxidized Soybean Oil with Self-Healing and Shape Memory Properties

High bio-based polymer foams face a critical challenge in balancing mechanical robustness with re-processability and environmental sustainability.In this work, a novel bio-based vitrimer foam was fabricated by integrating rigid rosin-derived Bis-glycidyl dehydroabietylamine epoxy resin (DGDHAA) with flexible epoxidized soybean oil (ESO) within a dynamic covalent network.Sodium bicarbonate served as the foaming agent, N,N-dimethylbenzylamine as the foam stabilizer, triethanolamine as the catalyst, and bis(3-aminopropyl) amine (BAPA) as both the curing agent and reactive diluent.The resulting DGDHAA/ESO-BAPA foams exhibited tunable glass transition temperatures (T g ) ranging from 95.88 • C to 98.65 • C with increasing BAPA content, along with excellent thermal stability.The optimized formulation achieved a compression resilience of 81.84%, demonstrating outstanding elastic recovery.Moreover, the foams displayed remarkable shape-memory behavior and self-healing capability: after thermal treatment at 120 • C for 2 h, the healed specimen could sustain a hanging load of 500 g without fracture.This work demonstrates that the rational combination of rigid rosin-based skeletons and flexible vegetable oil chains within a dynamic covalent network provides an effective strategy for developing high-performance, high bio-based foams with tunable thermal properties, excellent elasticity, self-healing ability, and environmental compatibility.