自修复型端羟基聚丁二烯粘合剂体系的制备及性能

Synthesis and Performance of Self-Healing Hydroxyl-Terminated Polybutadiene Binders

针对含能材料自修复特性需求,设计合成了2种新型化合物——端呋喃甲酯基聚丁二烯(FTPB)和三呋喃甲酯基丙烷(TFP),并进行结构表征。再以FTPB为主链、N,N'-(1,3-亚苯基)二马来酰亚胺(PDMI)为固化剂、TFP为扩链剂固化形成Diels-Alder反应体系,得到具有自修复能力和一定力学强度的粘合剂体系。利用红外光谱表征了粘合剂体系固化过程,通过特征基团峰值变化表明固化过程中Diels-Alder正反应的进行;拉伸测试和扫描电子显微镜表征了胶片的力学性能和自修复性能,结果表明在胶片产生微裂纹后能够通过热可逆过程完成修复,且测得扩链剂最佳加入量为10%的胶片拉伸强度达到1.76 MPa,修复效率为88%。

For the self-healing characteristics of energetic materials, two novel compounds, furfuryl-terminated polybutadiene （FTPB） and trifurfuryl propane （TFP） were designed and synthesized, and their structures were characterized. FTPB was used as main chain, N,N＇-（1,3-phenylene）bismaleimide （PDMI） was used as curing agent and TFP was used as chain extender to form the Diels-Alder reaction system, which can prepare the adhesive system with self-healing capacity and mechanical strength. The curing process of the adhesive system was characterized by FT-IR, which shows that the Diels-Alder reaction in the curing process was carried out by the peak change of characteristic functional groups. The mechanical properties and self-healing properties of the film were characterized by tensile test and SEM. The results show that the film with microcrack can be healed by the thermoreversible process, and the tensile strength of the film with the optimal addition ratio of 10% is 1.76 MPa and the heal efficiency is 88 %.