【摘要】 为探究多聚磷酸(PPA)复合改性海缆沥青综合性能与改性机理，对不同掺量PPA与SBR的PPA/SBR复合改性沥青进行常规指标测定实验，通过针入度、冷弯、黏附率以及热稳定性等实验考察PPA复合改性海缆沥青的高低温性能与黏附性能，并采用红外光谱试验、四组分试验、热重试验、核磁共振试验以及荧光显微图像观测试验来分析海缆沥青的复合改性机理，结果表明：PPA能够提高沥青的热储稳定性，SBR能够改善沥青的低温抗裂性能；SBR的改性机理以物理共混为主；PPA以化学改性为主，不仅改变了沥青碳链结构，使其发生磷酸酯化和环化反应，而且也提高了聚合物在沥青中的分布均匀性。更多还原

【Abstract】 In order to explore the comprehensive performance and modification mechanism of polyphosphoric acid(PPA) composite modified submarine cable asphalt, the conventional index determination experiment of PPA/SBR composite modified asphalt with different amounts of PPA and SBR was carried out, and the high and low temperature performance and adhesion performance of PPA composite modified submarine cable asphalt were investigated through penetration, cold bending, adhesion and thermal stability experiments. The composite modification mechanism of submarine cable asphalt was analyzed by infrared spectrum test, four-component test, thermogravimetric test, nuclear magnetic resonance test and fluorescence microscopic image observation test. The results showed that PPA can improve the thermal storage stability of asphalt, and SBR can improve the low-temperature cracking resistance of asphalt; The modification mechanism of SBR was mainly physical blending; The modification mechanism of PPA was mainly chemical modification, which not only changes the carbon chain structure of asphalt, making it undergo phosphorylation and cyclization reaction, but also improves the distribution uniformity of polymer in asphalt.更多还原