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<p>Due to the environmental concerns of petroleum-based polymers, there has been growing interest in sustainable biopolymers. This study synthesized an economical and eco-friendly biopolymer (Poly (acrylated epoxidized rapeseed oil), PAERO) from rapeseed oil through free radical polymerization. The molecular weight of PAERO was evaluated by the Gel Permeation Chromatography test, and its impact on the rheological properties of base asphalt was assessed using Dynamic Shear Rheometer and Bending Beam Rheometer tests. Additionally, the Atomic Force Microscopy test was utilized to explore the modification mechanism of PAERO on base asphalt. The results indicated that PAERO predominantly contains medium-molecular weight polymers (molecular weight: 13.2&#xa0;kDa) and some short-chain oligomers (2.56&#xa0;kDa). The inclusion of PAERO effectively improved the thermal and fatigue cracking resistance of base asphalt. The enhancements became more pronounced as PAERO dosage increased, that the base asphalt’s Δ<i>T</i><sub>c</sub> value was improved from −&#xa0;2.31 to 0.31&#xa0;℃ at a 10% dosage level. Furthermore, PAERO showed significant effect on the fatigue performance of base asphalt at elevated strain levels, that only the 5% PAERO content increasing the base asphalt’s fatigue life by 46.1% at a 5% strain level. At 52&#xa0;°C and 58&#xa0;°C, the base asphalt’s <i>J</i><sub>nr</sub> value decreased by 57.1% and 71.9%, respectively, while the recovery increased by 139.2% and 279.1% for the two PAERO dosages. These further manifested that the addition of PAERO substantially improved the rutting resistance of base asphalt, despite minimal changes in critical high temperatures. Notably, a significant increase in elasticity across the entire temperature range was noticed at a 10% dosage. Moreover, the incorporation of PAERO formed a crosslinking network structure within the asphalt, hindering the diffusion of asphaltenes. This phenomenon became more notable with increased dosage, resulting in a greater number of smaller “bee-like” structures observed in the morphologies at the microscopic level, and enhanced rheological properties at the macroscopic level. With the merit of sustainability, PAERO has demonstrated great potential as a bio-additive for sustainable asphalt pavements.</p>

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A novel sustainable biopolymer derived from rapeseed oil for asphalt binder: rheological performance and modification mechanism

  • 期刊论文

  • 发表日期：

    2025年6月14日

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  • Xiujie Quan,
  • Conglin Chen,
  • Xing Wang,
  • Tao Ma,
  • Yang Zhang

摘要

Due to the environmental concerns of petroleum-based polymers, there has been growing interest in sustainable biopolymers. This study synthesized an economical and eco-friendly biopolymer (Poly (acrylated epoxidized rapeseed oil), PAERO) from rapeseed oil through free radical polymerization. The molecular weight of PAERO was evaluated by the Gel Permeation Chromatography test, and its impact on the rheological properties of base asphalt was assessed using Dynamic Shear Rheometer and Bending Beam Rheometer tests. Additionally, the Atomic Force Microscopy test was utilized to explore the modification mechanism of PAERO on base asphalt. The results indicated that PAERO predominantly contains medium-molecular weight polymers (molecular weight: 13.2 kDa) and some short-chain oligomers (2.56 kDa). The inclusion of PAERO effectively improved the thermal and fatigue cracking resistance of base asphalt. The enhancements became more pronounced as PAERO dosage increased, that the base asphalt’s ΔTc value was improved from − 2.31 to 0.31 ℃ at a 10% dosage level. Furthermore, PAERO showed significant effect on the fatigue performance of base asphalt at elevated strain levels, that only the 5% PAERO content increasing the base asphalt’s fatigue life by 46.1% at a 5% strain level. At 52 °C and 58 °C, the base asphalt’s Jnr value decreased by 57.1% and 71.9%, respectively, while the recovery increased by 139.2% and 279.1% for the two PAERO dosages. These further manifested that the addition of PAERO substantially improved the rutting resistance of base asphalt, despite minimal changes in critical high temperatures. Notably, a significant increase in elasticity across the entire temperature range was noticed at a 10% dosage. Moreover, the incorporation of PAERO formed a crosslinking network structure within the asphalt, hindering the diffusion of asphaltenes. This phenomenon became more notable with increased dosage, resulting in a greater number of smaller “bee-like” structures observed in the morphologies at the microscopic level, and enhanced rheological properties at the macroscopic level. With the merit of sustainability, PAERO has demonstrated great potential as a bio-additive for sustainable asphalt pavements.