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<p>This study investigates the resistance of polymer modified bitumen (PMB) to ultraviolet (UV) radiation and oxidative aging, focusing on the role of styrene–butadiene–styrene (SBS) characteristics (structure, styrene/vinyl content, molecular weight) and the chemical composition of the base binder. Twelve PMBs were produced using three 70/100 base binders with different chemical composition and four SBS types (linear vs. radial, high vs. low vinyl). Samples were subjected to three laboratory aging protocols: short-term (<i>R</i>), short-term with UV exposure (R + UV), and extended long-term (R + P, pressure aging vessel (PAV) 40&#xa0;h). Aging effects were evaluated by Fourier-transform infrared (FTIR) spectroscopy and rheological tests, including multiple stress creep and recovery (MSCR), stress relaxation, and frequency sweeps. Results showed that extended long-term aging caused the most severe changes, with FTIR indices rising to 1.53–1.87, recovery decreasing more than twofold, and stress relaxation modulus increasing by up to 2 times, accompanied by a 28–34% loss in relaxation capacity. Base binder B (low saturates, high aromatics) produced the weakest unaged performance but the largest aging-induced changes, while base binder C (balanced maltenes) provided the most stable results. Radial SBS (molecular weight 118–144&#xa0;kDa) was more prone to oxidative transformations than linear SBS (molecular weight 77–79&#xa0;kDa). Vinyl content had only a minor effect, although high-vinyl SBS (31.3%) showed slightly lower resistance to UV aging compared with low-vinyl (7.3%) SBS. Overall, PMB durability is governed by both polymer architecture and base binder chemistry. Linear SBS combined with balanced maltene base binders offers the best resistance to UV and oxidative aging.</p>

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Resistance of polymer modified bitumen to UV radiation and oxidative aging depending on styrene–butadiene–styrene (SBS) characteristics and base binder chemical composition

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月18日

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  • Judita Škulteckė,
  • Audrius Vaitkus,
  • Ovidijus Šernas,
  • Georgios Pipintakos,
  • Simona Česnauskienė

摘要

This study investigates the resistance of polymer modified bitumen (PMB) to ultraviolet (UV) radiation and oxidative aging, focusing on the role of styrene–butadiene–styrene (SBS) characteristics (structure, styrene/vinyl content, molecular weight) and the chemical composition of the base binder. Twelve PMBs were produced using three 70/100 base binders with different chemical composition and four SBS types (linear vs. radial, high vs. low vinyl). Samples were subjected to three laboratory aging protocols: short-term (R), short-term with UV exposure (R + UV), and extended long-term (R + P, pressure aging vessel (PAV) 40 h). Aging effects were evaluated by Fourier-transform infrared (FTIR) spectroscopy and rheological tests, including multiple stress creep and recovery (MSCR), stress relaxation, and frequency sweeps. Results showed that extended long-term aging caused the most severe changes, with FTIR indices rising to 1.53–1.87, recovery decreasing more than twofold, and stress relaxation modulus increasing by up to 2 times, accompanied by a 28–34% loss in relaxation capacity. Base binder B (low saturates, high aromatics) produced the weakest unaged performance but the largest aging-induced changes, while base binder C (balanced maltenes) provided the most stable results. Radial SBS (molecular weight 118–144 kDa) was more prone to oxidative transformations than linear SBS (molecular weight 77–79 kDa). Vinyl content had only a minor effect, although high-vinyl SBS (31.3%) showed slightly lower resistance to UV aging compared with low-vinyl (7.3%) SBS. Overall, PMB durability is governed by both polymer architecture and base binder chemistry. Linear SBS combined with balanced maltene base binders offers the best resistance to UV and oxidative aging.