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<p>The current study investigates the thermal stability of four commercial-grade Styrene-butadiene-styrene (SBS) polymers in the asphalt binder (SBS-PBs) and corresponding asphalt mixes, focusing on differences in vinyl content (≤ 15% vs. ≥ 30%) within the SBS polymer. In the first scenario, the SBS-PBs were kept in metal containers at temperatures of 180, 150, and 120&#xa0;°C to mimic the transportation and storage settings. The findings reveal that at storage temperatures of 120 and 150&#xa0;°C, the properties of all the SBS-PBs were stable. However, at 180&#xa0;°C, modified binders containing SBS polymers with lower vinyl content (≤ 15%) experienced significant property deterioration due to polymer chain scission. In contrast, higher vinyl content SBS polymers (≥ 30%) demonstrated remarkable stability under the same conditions. The study highlights that a higher vinyl content correlates with an increased number of C=C bonds as the side group in the butadiene segment, which contributes to enhanced thermal stability. Additionally, the results illustrate that SBS concentration also influences property changes, with SBS-PBs containing 4.5 wt% of SBS polymer showing the greatest loss in conventional and rheological properties compared to those with 3 or 7 wt%. In the second scenario, RTFO and PAV aging of the SBS-PBs were carried out, while in the third scenario, asphalt mixes were subjected to laboratory aging. Binders with higher vinyl content SBS (≥ 30%) retained their properties even in the second and third thermo-oxidative aging conditions. These results clearly indicate that vinyl content is crucial for enhancing the thermo-oxidative stability of SBS-PBs for effective binder modification and pavement durability.</p>

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Enhancing thermo-oxidative stability of modified binders and asphalt mixes: critical role of vinyl groups in SBS polymer

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Sumit K. Singh,
  • Sk Sohel Islam,
  • R. N. G. D. Ransinchung,
  • Sham S. Ravindranath

摘要

The current study investigates the thermal stability of four commercial-grade Styrene-butadiene-styrene (SBS) polymers in the asphalt binder (SBS-PBs) and corresponding asphalt mixes, focusing on differences in vinyl content (≤ 15% vs. ≥ 30%) within the SBS polymer. In the first scenario, the SBS-PBs were kept in metal containers at temperatures of 180, 150, and 120 °C to mimic the transportation and storage settings. The findings reveal that at storage temperatures of 120 and 150 °C, the properties of all the SBS-PBs were stable. However, at 180 °C, modified binders containing SBS polymers with lower vinyl content (≤ 15%) experienced significant property deterioration due to polymer chain scission. In contrast, higher vinyl content SBS polymers (≥ 30%) demonstrated remarkable stability under the same conditions. The study highlights that a higher vinyl content correlates with an increased number of C=C bonds as the side group in the butadiene segment, which contributes to enhanced thermal stability. Additionally, the results illustrate that SBS concentration also influences property changes, with SBS-PBs containing 4.5 wt% of SBS polymer showing the greatest loss in conventional and rheological properties compared to those with 3 or 7 wt%. In the second scenario, RTFO and PAV aging of the SBS-PBs were carried out, while in the third scenario, asphalt mixes were subjected to laboratory aging. Binders with higher vinyl content SBS (≥ 30%) retained their properties even in the second and third thermo-oxidative aging conditions. These results clearly indicate that vinyl content is crucial for enhancing the thermo-oxidative stability of SBS-PBs for effective binder modification and pavement durability.