GAP基自修复粘结剂的制备及性能

Preparation and Performance of Self-healing Binder Based on GAP

为了延长粘结剂的储存寿命,采用一步法将具有可自修复性能的双硫官能团引入叠氮粘结剂中,首次合成了具有自修复性能的聚叠氮缩水甘油醚(GAP)基自修复粘结剂。通过傅里叶红外光谱(FTIR)、X射线衍射(XRD)和光学显微镜对其结构和表面形貌进行表征,在此基础上,通过自修复前后拉伸强度的变化,考察了不同自修复温度和不同自修复时间下的自修复效率。结果显示:合成的GAP基自修复粘结剂具有聚氨酯结构,60℃下24 h后表面裂纹基本愈合完全。提高自修复温度和延长自修复时间,均有助于提高体系的自修复效率。同时随着交联剂质量分数的增加,自修复效率先提高后降低,其中交联剂质量分数为8%的配方,自修复效率可达98.2%,相对于自修复效率为61.7%的对比样,表明双硫官能团的引入能够提高体系的自修复效率。

To prolong the storage life of binder,the poly(glycidyl azide)ether(GAP)-based binders with self-healing performance were firstly synthesized by introducing disulfide functional group into an azide binder through an one-step method.Fourier transform infrared spectroscopy(FTIR),X-ray diffractometry(XRD)and optical microscopy were used to characterize its structure and surface topography characterization.On this basis,the self-healing efficiency under different self-healing temperature and different self-healing time was examined through the change of tensile strength before and after self-healing.Results show that the synthesized GAP-based self-healing binder has a polyurethane structure,the surface cracks of self-healing binder are completely healed after 24 h at 60℃.Increasing the temperature and prolonging the self-healing time are helpful to improve the self-healing efficiency.At the same time,the self-healing efficiency is firstly improved and then decreased with increasing mass fraction of the cross-linking agent,in which,the self-healing efficiency for the formula with a cross-linker mass fraction of 8%can reach 98%.Compared with control sample with the self-healing efficiency as 61.7%,which proves that the introduction of disulfide functional groups can improve the self-healing efficiency of the system.