In recent years, bio-based covalent adaptable networks (CANs) and vitrimers have developed rapidly in order to meet the renewable and sustainable requirements. It should be emphasized that the performance of the network need be upgraded and optimized to substitute petroleum-based polymers. Herein, a series of high-performance bio-based polyurethane were synthesized containing castor oil, isosorbide, vanillin derivative and 4,4′-Dicyclohexylmethane diisocyanate. By fine-tuning the bio-based diols, the hydrogen bond distribution and the crosslink density of the network were adjustable. The thermal mechanical properties and stress relaxation properties of the bio-based polyurethane were optimized. The bio-based polyurethane CANs shows tensile strength of 38.1 MPa, elongation at break of 243% and toughness of 55.7 MJ m⁻³, which is outstanding among most reported bio-based CANs. In addition, the polymer has excellent water resistance, shape memory and re-deformability. Due to the dissociation of imine bonds under mild acid conditions, the carbon fiber composite can readily degrade in mixed solvent for 3 h at 60 °C and the properties of recycled carbon fibers are highly preserved.

近年来，基于生物的共价适应性网络（CAN）和玻璃体迅速发展，以满足可再生和可持续的需求。应该强调的是，网络的性能需要升级和优化以替代石油基聚合物。在此，合成了一系列含有蓖麻油、异山梨醇、香草醛衍生物和4,4'-二环己基甲烷二异氰酸酯的高性能生物基聚氨酯。通过微调生物基二醇，可以调节网络的氢键分布和交联密度。优化了生物基聚氨酯的热力学性能和应力松弛性能。生物基聚氨酯 CAN 的拉伸强度为 38.1 MPa，断裂伸长率为 243%，韧性为 55.7 MJ m ^-3，这在大多数报道的生物基 CAN 中表现出色。此外，该聚合物具有优异的耐水性、形状记忆性和再变形性。由于亚胺键在弱酸性条件下的解离，碳纤维复合材料在混合溶剂中 60 ℃ 3 h 时很容易降解，回收碳纤维的性能得到高度保留。