在热氧化衰老下,纳米-Al2O3/ styrene-butadiene-styrene-modified青的衰老行为和机制的演变
Zhiyuan Ji1, Xing Wu2, Yao Zhang1
1College of Architectural Science and Engineering, Yangzhou University, Yangzhou 225100, China.
Materials (Basel, Switzerland)
|September 9, 2023
概括
纳米氧化物 (NA) 通过抑制化学变化和聚合物降解,增强了 styrene-butadiene-styrene (SBS) 青的耐老性. 这提高了材料在热氧化应激下的耐用性.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物化学 聚合物化学
- 土木工程 土木工程是指土木工程.
背景情况:
- styrene-butadiene-styrene (SBS) 改性青在路面工程中被广泛使用.
- 了解青粘合剂的老化行为对于预测路面性能和寿命至关重要.
- 热氧化老化显著降低了青的性能,影响了它的使用寿命.
研究的目的:
- 在热氧化条件下研究纳米氧化物 (NA) 增强的SBS青的衰老行为和机制演变.
- 评估NA对SBS青耐老化的影响.
- 为了将属性变化与衰老过程中的化学和形态变化相关联.
主要方法:
- 准备NA/SBS修饰和SBS修饰的青,其老化程度不同.
- 风湿学测试 (粘度,高温性能) 和计算与物质相关的衰老指数.
- 福里埃变换红外光谱 (FTIR) 用于化学组分析和指数计算.
- 凝透色谱 (GPC) 用于分子重量测定.
- 原子力显微镜 (AFM) 用于微表面形态分析.
主要成果:
- NA显著提高了SBS青的热氧化衰老抵抗力.
- 添加NA抑制了硫氧化基的形成,并减轻了老化过程中的SBS聚合物降解.
- 在老青中,NA减缓了大分子量成分的形成.
- 与SBS青相比,NA/SBS青在蜜蜂结构和微观形态粗度上的变化较小.
结论:
- 纳米氧化作为SBS青的有效抗衰老添加剂.
- 通过保持聚合物完整性和控制分子体重演变,NA的存在改变了老化机制.
- 经NA改性青表现出对热氧化降解的优越抵抗力,从而提高了长期性能.
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