在压力老化条件下PPA/SBS/SBR复合材料改性青和青混合物的粘性弹性
Zongjie Yu1,2, Xinpeng Ling2,3, Ze Fan2,3
1College of Transportation Engineering, Changsha University of Science and Technology, Changsha 410114, China.
Polymers
|March 13, 2025
概括
这项研究揭示了复合改性青 (CMA) 与乙烯乙烯 (SBS) 和乙烯 (SBR) 如何衰老. 这些发现显示出改善的粘弹性和动态模量,为路面修复提供了洞察力.
科学领域:
- 材料科学 材料科学 材料科学
- 土木工程 土木工程是指土木工程.
- 聚合物化学 聚合物化学
背景情况:
- 青的粘弹性行为对路面性能和设计至关重要.
- 了解粘合剂老化对于预测长期路面耐用性至关重要.
- 复合改性青 (CMA) 提供了增强路面性能的潜力.
研究的目的:
- 在老化过程中研究PPA/SBS/SBR改性青的分子结构和成分演变.
- 在加速老化条件下分析CMA混合物的粘弹性演变.
- 为了澄清在动态负载下老化的CMA混合物的粘弹性特性.
主要方法:
- 使用滚动薄膜炉试验 (RTFOT) 和压力老化容器 (PAV) 加速老化.
- 通过富里埃变换红外光谱学 (FTIR) 和凝浸透色谱学 (GPC) 进行微观分析.
- 风病学测试包括动态模量和温度扫描测试.
主要成果:
- SBS和SBR的结合改变了分子组成,减缓了大分子含量变化,并缩小了分子重量分布.
- 与SBS和SBR老化的CMA混合物显示动态模量增加 (例如,AC-13在25 Hz,-10 °C时为24.3%).
- 相角 (φ) 减少,表明刚度改善,永久变形潜力减少.
结论:
- 同时添加SBS和SBR可以提高CMA的耐老化和粘弹性性能.
- 经过修改的青在老化后在动态负载下表现出更好的机械性能.
- 这项研究为使用CMA在路面坑修复应用程序中提供了有价值的数据.
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