Abstract This article presents an investigation of 6 different triblock SBS (styrene-butadien-styrene) polymers with different structure (radial and linear) and different butadien:styrene ratio, used for modifying bitumen (70/100) with 5 and 16% polymer content. The behaviour of the polymer and the polymer modified bitumen (PmB) is characterized by dynamical shear rheometer (DSR), differential scanning calorimetry (DSC) and fluorescence microscopy (FM). The conditions for the formation of a polymer network within PmB and its effect on the mechanical performance of PmB were investigated. Based on the obtained results the number of styrene end blocks was identified as the key parameter for the formation of a polymer network. The polystyrene content controlled the coalescence and hence the distribution of polymer within the PmB. An increased polybutadiene content, on the other hand, lead to a more pronounced swelling of polymer within PmB by the adsorption of the maltene phase from bitumen, resulting in an increase of the polybutadiene particle size.

中文翻译：

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SBS分子结构对聚合物改性沥青热机械性能的影响

摘要 本文研究了 6 种不同结构（径向和线性）和不同丁二烯:苯乙烯比的三嵌段 SBS（苯乙烯-丁二烯-苯乙烯）聚合物，用于改性聚合物含量为 5% 和 16% 的沥青 (70/100)。 . 聚合物和聚合物改性沥青 (PmB) 的行为由动态剪切流变仪 (DSR)、差示扫描量热法 (DSC) 和荧光显微镜 (FM) 表征。研究了在 PmB 内形成聚合物网络的条件及其对 PmB 机械性能的影响。根据获得的结果，苯乙烯末端嵌段的数量被确定为形成聚合物网络的关键参数。聚苯乙烯含量控制聚结并因此控制聚合物在 PmB 中的分布。