An ultralow-temperature superelastic polymer aerogel with high strength as a great thermal insulator under extreme conditions,Journal of Materials Chemistry A

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An ultralow-temperature superelastic polymer aerogel with high strength as a great thermal insulator under extreme conditions
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-08-12 , DOI: 10.1039/d0ta05542e
Ting Wang _{1,

2,

3,

4,

5} , Man-Cheng Long _{1,

2,

3,

4,

5} , Hai-Bo Zhao _{1,

2,

3,

4,

5} , Bo-Wen Liu _{1,

2,

3,

4,

5} , Hai-Gang Shi _{1,

2,

3,

4,

5} , Wen-Li An _{1,

2,

3,

4,

5} , Shu-Liang Li _{1,

2,

3,

4,

5} , Shi-Mei Xu _{1,

2,

3,

4,

5} , Yu-Zhong Wang _{1,

2,

3,

4,

5}

Affiliation

In extremely low-temperature environments such as aerospace and polar regions, advanced elastic thermal insulation materials are urgently needed but their development is challenging, as traditional elastic insulators are completely “frozen”, lose elasticity and become brittle. Herein, we proposed a novel structural elastic strategy to create an ultralow-temperature elastic polymer aerogel with highly oriented thin nanosheets and hierarchically honeycomb-like architectures from low-cost raw materials. This approach endowed the polymer aerogel with superelasticity and high strength at liquid nitrogen temperature (−196 °C), where the aerogel can bear more than 10 000 times its weight and repeatedly recover to its original size after force removal. The underlying structural elastic mechanism was revealed by finite element simulation calculation. The resultant robust aerogel also displayed an excellent extreme-condition thermal insulation, which could maintain a pleasant interior environment with small temperature changes under harsh external environments from liquid nitrogen to fire scenarios. It combined the great features of ultralow-temperature superelasticity with high mechanical strength, excellent thermal insulation under extremely harsh conditions, fire retardancy, and performance stability. These results provide new insights and general methods for the development of advanced super-elastic polymeric insulators with high strength at ultralow temperatures.

中文翻译：

具有极高强度的超低温超弹性聚合物气凝胶，可在极端条件下用作绝热材料

在航空航天和极地地区等极端低温环境中，迫切需要高级弹性绝热材料，但由于传统的弹性绝热材料被完全“冻结”，失去弹性并变脆，因此其开发具有挑战性。在这里，我们提出了一种新颖的结构弹性策略，以低成本的原材料创建具有高度定向的薄纳米片和分层蜂窝状结构的超低温弹性聚合物气凝胶。这种方法使聚合物气凝胶在液氮温度（-196°C）下具有超弹性和高强度，其中气凝胶可以承受超过其重量的10000倍，并且在去除力后可以反复恢复到其原始大小。通过有限元模拟计算揭示了潜在的结构弹性机制。所得的坚固气凝胶还显示出优异的极端条件绝热性能，可以在从液氮到火灾的恶劣外部环境下保持舒适的内部环境以及较小的温度变化。它结合了超低温超弹性和高机械强度，在极端恶劣条件下具有出色的隔热性，阻燃性和性能稳定性等重大特征。这些结果为开发在超低温下具有高强度的高级超弹性聚合物绝缘子提供了新的见识和常规方法。在恶劣的外部环境（从液氮到着火的情况）下，它可以保持舒适的内部环境以及较小的温度变化。它结合了超低温超弹性和高机械强度，在极端恶劣条件下具有出色的隔热性，阻燃性和性能稳定性等重大特征。这些结果为开发在超低温下具有高强度的高级超弹性聚合物绝缘子提供了新的见识和常规方法。在恶劣的外部环境（从液氮到着火的情况）下，它可以保持舒适的内部环境以及较小的温度变化。它结合了超低温超弹性和高机械强度，在极端恶劣条件下具有出色的隔热性，阻燃性和性能稳定性等重大特征。这些结果为开发在超低温下具有高强度的高级超弹性聚合物绝缘子提供了新的见识和常规方法。

更新日期：2020-09-22

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