Sun Shuang, Liu Peiqi, Shi Chenglin, Zhang Hanwen
School of Transportation Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
ACS Omega. 2025 Aug 25;10(35):40635-40645. doi: 10.1021/acsomega.5c07544. eCollection 2025 Sep 9.
With the increase in service life of transportation infrastructure, highway crack repair materials have become a critical factor restricting road maintenance quality. Therefore, in order to cope with the technical bottlenecks of insufficient high-temperature stability and poor low-temperature ductility of traditional sealants, a new chemical grafting modified asphalt sealant, maleic anhydride grafted styrene-butadiene block copolymer (MAH--SBS) modified asphalt sealant, was developed. Benzoyl peroxide (BPO) was used as the initiator to generate MAH--SBS by maleic anhydride (MAH) grafting, modifying styrene-butadiene block copolymer (SBS). Through the coupling of completely randomized design and orthogonal experimental design, a MAH--SBS grafting rate prediction model was obtained by multiple nonlinear regression analysis, which considers the effects of reaction time, initiator dosage, reaction monomer dosage, and reaction temperature. Meanwhile, the significance of factors on grafting rate was clarified by the analysis of variance (ANOVA) and the prediction model validity was verified by error analysis. The prediction model and test data were both considered, and the maximum grafting rate was 20%. Simultaneously, by combining Fourier transform infrared spectroscopy (FTIR), the modification mechanism was revealed through the relationship between the carbonyl characteristic peak intensity and the road performance of the material. Subsequently, the road performances of MAH--SBS modified asphalt sealants with different grafting rates were studied by a series of laboratory tests and it was found that with the increase of grafting rate, the ductility, viscosity, and resilience recovery significantly increased and the softening point first decreased and then increased, but the cone penetration decreased. Meanwhile, based on the gray relational analysis, the grafting rate had the most significant impact on ductility and the least impact on cone penetration.
随着交通基础设施服役年限的增加，公路裂缝修复材料已成为制约道路养护质量的关键因素。因此，为应对传统密封胶高温稳定性不足和低温延展性差的技术瓶颈，研发了一种新型化学接枝改性沥青密封胶，即马来酸酐接枝苯乙烯-丁二烯嵌段共聚物（MAH-SBS）改性沥青密封胶。以过氧化苯甲酰（BPO）为引发剂，通过马来酸酐（MAH）接枝改性苯乙烯-丁二烯嵌段共聚物（SBS）制备MAH-SBS。通过完全随机设计与正交试验设计相结合，经多元非线性回归分析得到了考虑反应时间、引发剂用量、反应单体用量和反应温度影响的MAH-SBS接枝率预测模型。同时，通过方差分析（ANOVA）阐明了各因素对接枝率的显著性，并通过误差分析验证了预测模型的有效性。综合考虑预测模型和试验数据，最大接枝率为20%。同时，结合傅里叶变换红外光谱（FTIR），通过羰基特征峰强度与材料路用性能的关系揭示了改性机理。随后，通过一系列室内试验研究了不同接枝率的MAH-SBS改性沥青密封胶的路用性能，发现随着接枝率的增加，延展性、粘度和回弹恢复率显著提高，软化点先降低后升高，但针入度降低。同时，基于灰色关联分析，接枝率对延展性影响最为显著，对针入度影响最小。
