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Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
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.

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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一种通过缺陷工程实现超高固态冷却的弹性热量聚合物.

Zhaohan Yu1, Duo Xu2, Zumrat Usmanova3

  • 1Department of Mechanical Engineering, Michigan State University, East Lansing, MI, 48824, USA.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|December 13, 2025
PubMed
概括
此摘要是机器生成的。

弹性热聚合物的缺陷工程显著提高了固态冷却性能. 这种方法优化了应变诱导和温度诱导结晶之间的平衡,从而改善了亚亚巴特温度变化.

关键词:
弹性性聚合物 弹性性聚合物固态冷却系统的冷却方式应变诱导结晶的过程.四臂聚乙烯糖醇) 是一种四臂聚乙烯糖醇.拓上的缺陷 拓上的缺陷

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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
  • 热力学是一种热力学.

背景情况:

  • 弹性热量聚合物通过利用相变换,为传统制冷提供了可持续的替代方案.
  • 工程聚合物网络可以提高弹性热量性能,但拓缺陷的影响在很大程度上是未知的.
  • 拓缺陷在聚合物中很常见,可能会影响其弹性热量特性.

研究的目的:

  • 调查弹性热聚合物的拓缺陷的作用.
  • 开发一种缺陷工程策略,以增强末结星聚合物 (ELSP) 中的弹性热量冷却.
  • 了解缺陷度和亚亚巴特温度变化之间的关系.

主要方法:

  • 合成的端链恒星聚合物 (ELSPs) 具有不同度的悬挂链缺陷.
  • 描述了合成聚合物的弹性卡路里性质,包括附加性温度变化.
  • 分析了缺陷对应力诱导结晶 (SIC) 和温度诱导结晶 (TIC) 的影响.

主要成果:

  • 在65°C以上的环境温度下,达到高达8.14±1.76°C的增热温度变化.
  • 与无缺陷的ELSP相比,表现出39%的弹性热量性能提升.
  • 确定了悬挂链缺陷对SIC和TIC的相互竞争的影响,这些缺陷协同调节了热温度变化.
  • 观察到越来越多的缺陷单调地降低了高温机械性能 (压抑的SIC),但非单调地影响了低温性能 (竞争的SIC和增强的TIC).

结论:

  • 在ELSP中缺陷工程是一种可行的策略,可以显著提高固态冷却性能.
  • 由悬挂链缺陷调节的SIC和TIC之间的相互作用对于优化弹性热量效应至关重要.
  • 这项工作为elastocaloric聚合物中缺陷属性关系提供了基本的见解,为先进的冷却材料铺平了道路.