Feasible self-healing CL-20 based PBX: Employing a novel polyurethane-urea containing disulfide bonds as polymer binder
Feasible self-healing CL-20 based PBX: Employing a novel polyurethane-urea containing disulfide bonds as polymer binder
复制标题
DOI：
10.1016/j.reactfunctpolym.2019.104342
复制
发表时间：
2019-11-01
影响因子：
5.1
通讯作者：
Lin, Congmei
中科院分区：
文献类型：
--
作者：
Li, Yubin;Yang, Zhijian;Lin, Congmei
功能材料产生的损伤会降低其性能并缩短其寿命，赋予材料自修复能力有望解决这一问题。在这项工作中，通过将二硫键引入聚合物粘合剂中，设计并制备了一种新型含能复合材料，即基于CL-20的PBX，它可以在温和条件下自愈其机械损伤。以异佛尔酮二异氰酸酯（IPDI）为主链的聚己内酯二醇（PCL-diol）预聚物合成了高效自修复含二硫键聚氨酯脲（DSPU），获得了良好的机械韧性，再与双（4-氨基苯基）二硫化物（APD）交联，获得了优异的机械韧性。 可逆性。使用该DSPU作为粘合剂的CL-20基PBX在60℃加热数小时后可以明显自愈其内部损伤，即微裂纹，并且受损样品在巴西测试后的强度也可以恢复到原始值的70％以上。
Damages generated in functional materials can deteriorate their performance and shorten their lifetime, endowing the materials with self-healing ability is expected to resolve this problem. In this work, a novel energetic composite refers to CL-20 based PBX, which can self-heal its mechanical damage under a mild condition, was designed and prepared via incorporating disulfide bonds into the polymeric binder. The highly efficient self-healing polyurethane-urea containing disulfide bonds (DSPU) was synthesized by using the prepolymer of poly (caprolactone) diol (PCL-diol) with isophorone diisocyanate (IPDI) as the main-chain to achieve good mechanical toughness, then cross-linking with bis(4-aminophenyl) disulfide (APD) to gain the superior reversibility. The CL-20 based PBX using this DSPU as binder can evidently self-heal its inner damage, i.e. micro-crack, after heating at 60 degrees C for several hours, and the strength of the damaged sample after Brazilian test can also be recovered to more than 70% of the pristine value.