To expand the variety of partially bio-based epoxy resins with superior performance and improve the efficiency of utilizing renewable raw materials, a chitosan-based bisphenol A epoxy resin (CBE) was successfully synthesized. With PA651 as the curing agent, the strain energy CBE/PA651 reached 15.11 MJ m⁻³, which was higher than those of many typical ductile epoxy resins in comparative literature. The shape fixity and shape recovery rate of CBE/PA651 were 94.72 % and 98.74 %, respectively, demonstrating excellent shape memory effects. When CBE was used as wood adhesives, it exhibited a relatively high bonding strength and excellent water resistance, and the dry and boiling bond strength can exceed 4.08 MPa and 1.91 MPa, respectively. Simultaneously, CBE/PA651 can be completely degraded within 8 h at 90 °C, exhibiting excellent degradability. In addition, CBE was employed as a toughening agent for DGEBA/DDM. It was found that when the CBE content was 20 wt%, the elongation at break, the impact strength, and K_IC of CBE/DGEBA/DDM reached their peak values of 8.55 %, 17.62 kJ m⁻² and 1.75 MPa m^1/2 respectively, representing a significant increase of 101.65 %, 43.6 %, and 78.57 % compared to DGEBA/DDM. The toughening mechanism was revealed by SEM and crosslinking simulation networks.

中文翻译：

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以可再生壳聚糖为反应原料的多功能部分生物基环氧树脂：形状记忆效应、粘合性、优异的降解性和增韧性能


为了扩大性能卓越的部分生物基环氧树脂的种类并提高可再生原材料的利用效率，成功合成了壳聚糖基双酚 A 环氧树脂 （CBE）。以 PA651 为固化剂，应变能 CBE/PA651 达到 15.11 MJ m⁻³，高于比较文献中许多典型的延展性环氧树脂。CBE/PA651 的形状固定率和形状恢复率分别为 94.72 % 和 98.74 %，表现出优异的形状记忆效果。当 CBE 用作木材胶粘剂时，它表现出相对较高的粘合强度和优异的耐水性，干粘接强度和沸腾粘合强度分别可超过 4.08 MPa 和 1.91 MPa。同时，CBE/PA651 可在 90 °C 下 8 h 内完全降解，表现出优异的降解性。此外，CBE 还被用作 DGEBA/DDM 的增韧剂。结果表明，当 CBE 含量为 20 wt% 时，CBE/DGEBA/DDM 的断裂伸长率、冲击强度和 K_IC 分别达到峰值 8.55 %、17.62 kJ ^m-2 和 1.75 MPa m^1/2，与 DGEBA/DDM 相比显著提高了 101.65 %、43.6 % 和 78.57 %。SEM 和交联模拟网络揭示了增韧机制。