超高刚性和坚固形状记忆聚尿素具有前所未有的能量密度,通过精确的轻微交叉连接
Jiaoyang Chen1, Zhifeng Wang2, Bowen Yao1
1School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|April 22, 2024
概括
研究人员开发了一种由肌肉纤维启发的新型共价和超分子形状记忆聚尿素. 这种先进的聚合物为各种应用提供了卓越的机械性能,耐用性和形状记忆效果.
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
- 纳米技术纳米技术
背景情况:
- 传统的形状记忆聚合物 (SMP) 在机械强度,环境弹性和能量储存能力方面存在局限性.
- 这些缺陷限制了SMP在要求高的应用程序中的实际实施.
- 需要具有增强性能特征的先进SMP.
研究的目的:
- 设计一种具有改进的机械性能和形状记忆性能的新型形状记忆聚合物.
- 通过整合共价化学和超分子化学,探索创建高性能SMP的新战略.
- 研究开发材料中的结构-属性关系.
主要方法:
- 制造一种共价和超分子形状记忆的聚尿素,使用一个层次的键超分子网络.
- 结合了灵感来自肌肉纤维结构的微妙,永久的交叉连接.
- 机械性能 (刚性,强度,性),可回收性,可修复性,环境耐用性和形状记忆行为 (能量密度,形状固定性,形状恢复) 的表征.
主要成果:
- 开发出来的聚尿素具有特殊的机械性能:刚性 (1347 MPa),强度 (82.4 MPa) 和性 (312.7 MJ m−3).
- 该材料表现出出色的形状记忆效果,具有高能量密度 (24.5 MJ m-3),96%的形状固定性和99%的形状恢复.
- 该聚合物显示出优异的可回收性,可修复性,以及对水分,热量和溶剂的抗性.
结论:
- 在一个等级网络中结合共价键和超分子键的新策略导致高性能形状记忆聚氨酸.
- 这种材料克服了传统SMP的局限性,为高级应用提供了一个有前途的平台.
- 开发的聚合物的独特特性为更广泛地利用形状记忆材料铺平了道路.
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