Styrene-butadiene-styrene triblock copolymer (SBS) modified bitumen (SMB) with excellent self-healing performance not only saves resources, but is also important for the sustainable development of pavement and construction industry. In this paper, a self-healing agent (SHA) with acylhydrazone bond was synthesized, and the dynamic acylhydrazone bond was introduced into the SBS molecular chains to prepare the self-healing SMB (SHMB). The structure of SHA was characterized, and the physical properties, chemical structure, microstructure and self-healing performance of the SHMB were investigated. Fourier transform infrared (FTIR) spectra and nuclear magnetic resonance spectra demonstrated that SHA was successfully synthesized. The physical performances of SMB were significantly improved by SHA and its optimal dosage was 0.6 %. FTIR indicated that the dynamic acylhydrazone bond was introduced into the SBS molecular chains, and formed hydrogen bonds in SHMB. The fluorescence microscope showed that SHMB had a denser network structure than SMB. The crack healing observation indicated that the crack healing speed of SHMB was much higher than that of SMB. The break tensile performance recovery showed that the recovery rate of elongation at break (R) of SMB and SHMB were 14.38 % and 58.27 % after self-healing at 25℃ for 32 h, and the R of SMB and SHMB was elevated to 50.12 % and 92.58 % after self-healing at 40℃ for 4 h, which indicated that the introduction of dynamic acylhydrazone bonds greatly enhanced the self-healing ability of SHMB.

中文翻译：

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动态酰腙键自修复SBS改性沥青的制备及性能

苯乙烯-丁二烯-苯乙烯三嵌段共聚物（SBS）改性沥青（SMB）具有优异的自修复性能，不仅节约资源，而且对于路面和建筑业的可持续发展也具有重要意义。本文合成了一种带有酰腙键的自修复剂（SHA），并将动态酰腙键引入到SBS分子链中，制备了自修复SMB（SHMB）。对SHA的结构进行了表征，并对SHMB的物理性能、化学结构、微观结构和自修复性能进行了研究。傅里叶变换红外（FTIR）光谱和核磁共振光谱表明SHA已成功合成。 SHA显着改善了SMB的物理性能，其最佳用量为0.6%。 FTIR表明动态酰腙键被引入到SBS分子链中，并在SHMB中形成氢键。荧光显微镜显示SHMB比SMB具有更致密的网络结构。裂纹愈合观察表明SHMB的裂纹愈合速度远高于SMB。断裂拉伸性能恢复结果表明，25℃自修复32 h后，SMB和SHMB的断裂伸长率(R)恢复率分别为14.38%和58.27%，其中SMB和SHMB的R提高至50.12%。 40℃下4 h自修复后的自修复率达到92.58%，表明动态酰腙键的引入大大增强了SHMB的自修复能力。