以基质沥青及不同分子结构的苯乙烯-丁二烯-苯乙烯共聚物SBS(线型L-SBS与星型S-SBS)改性沥青为研究对象,系统探讨了热氧老化对其流变行为和微观相形态的影响。结果表明:基质沥青在老化过程中储能模量(G′)与损耗模量(G″)逐渐增大,由黏性流体转变为类固体状态。老化导致的轻组分挥发和沥青质含量上升使特征松弛峰向长时间方向移动,使体系黏度显著提高。微观形貌与流变测试结果显示,当SBS质量含量≥6%时,SBS形成连续相网络,其中S-SBS因化学交联结构表现出较强的结构初始稳定性,而L-SBS体系在老化过程中具有更好的网络保持性和抗老化性能。多模态Maxwell模型拟合结果表明,随老化时间的延长,体系由弹性主导向黏性主导转变。复数黏度(η*)分析进一步显示,9L-SMB体系在老化过程中η*增长最缓慢,表明其抗老化性能最佳。揭示了SBS分子结构差异对改性沥青在热氧老化中流变演化和相态转变的调控作用,为改性沥青的分子设计与耐老化性能优化提供了重要参考。
This study investigated the effects of thermo-oxidative aging on the rheological behavior and microscopic phase morphology by taking base asphalt and styrene-butadiene-styrene (SBS) copolymer-modified asphalts with different molecular structures,namely linear (L-SBS) and star-shaped (S-SBS) types as research subjects.The results indicated that both the storage modulus (G′) and loss modulus (G″) of base asphalt gradually increased with aging time,transforming the material from a viscous fluid to a quasi-solid state.Aging-induced volatilization of light components and an increased in asphaltene content shifted the characteristic relaxation peak toward longer times,significantly increasing viscosity.Microscopic and rheological analyses showed that when the SBS content exceeded 6 wt%,SBS formed continuous-phase networks.Among them,the S-SBS system exhibited greater initial structural stability due to chemically crosslinked structure,while the L-SBS system maintained a more stable network structure and superior anti-aging performance during prolonged aging.The multimodal Maxwell model fitting results revealed that the viscoelastic behavior gradually shifted from elasticity-dominated to viscosity-dominated with the increase of aging time.Complex viscosity (η*) analysis further showed that the 9L-SMB system displayed the slowest viscosity growth during aging,indicating the best resistance to thermo-oxidative aging.These findings clarified the role of SBS molecular structure in governing the rheological evolution and phase transition of modified asphalts during aging,providing theoretical and technical insights for the molecular design and durability enhancement of asphalt materials.
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基金资助
山西省基础研究计划自然科学研究面上项目(202303021211075);山西省基础研究计划联合资助项目(202303011222003);山西交通科学研究院集团有限公司创新发展计划项目(24-JKCF-18);山西省青年科学研究项目(202303021222388)
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