碳纳米管具有不变温度的粘弹性,从 -196 度到 1000 度C
Ming Xu1, Don N Futaba, Takeo Yamada
1Technology Research Association for Single Wall Carbon Nanotubes (TASC) and Nanotube Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan.
Science (New York, N.Y.)
|December 4, 2010
概括
研究人员开发了一种新的碳纳米管材料,具有特殊的粘弹性特性. 这种材料在196°C至1000°C的空前温度范围内保持稳定性,性能优于传统弹性体.
科学领域:
- 材料科学 材料科学 材料科学
- 聚合物科学 聚合物科学
- 纳米技术 纳米技术
背景情况:
- 粘性弹性是具有粘性和弹性特征的材料的关键性质.
- 传统的粘弹性材料,如,具有有限的操作温度范围.
- 材料分解或硬化发生在这些特定温度限制之外.
研究的目的:
- 设计一种具有扩大操作温度范围的新型粘弹性材料.
- 研究基于碳纳米管的粘弹性材料的热稳定性和机械性能.
主要方法:
- 从一个随机的长,相互连接的碳纳米管网络中创建一个粘弹性材料.
- 评估操作温度范围,存储和损失模块,频率稳定性,可逆变形和耐疲劳性.
- 分析热稳定机制,特别是纳米管接触处的能量消散.
主要成果:
- 开发的碳纳米管材料显示了从196°C到1000°C的操作温度范围.
- 包括模块,频率稳定性和耐疲劳性在内的关键特性在-140°C和600°C之间保持不变.
- 热稳定性归因于通过碳纳米管在接触点上的拉链和解拉链来消耗能量.
结论:
- 一种新的碳纳米管粘弹性材料与传统材料相比,具有更高的热稳定性.
- 该材料的独特结构使其在异常广泛的温度谱中实现了强大的性能.
- 了解纳米管接触力学对于设计先进的粘弹性材料至关重要.
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To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.