动态非共价键驱动增强的临时形状保留温度和机械强度在形状记忆中的聚氨.
Kai Zhou1,2, Qingxiang Zhang1,2, Junhui Gong2
1School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, P. R. China.
ACS applied materials & interfaces
|November 6, 2024
概括
这项研究开发了使用刚性聚胺酸和金属协调的先进形状记忆聚氨 (SMPU). 新的SMPU表现出增强的机械性能,自我愈合和金属粘合力,用于工程应用.
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
背景情况:
- 形状记忆聚氨 (SMPU) 具有工程潜力,但由于依赖结合,通常具有较低的过渡温度.
- 在SMPU中,高强度和性通常受到室温以下的变形温度的限制.
研究的目的:
- 开发一种新的形状记忆聚氨 (SMPU),具有更高的相位过渡温度和更好的机械性能.
- 探索使用刚性长链聚胺酸和金属协调来增强SMPU特性.
主要方法:
- 在聚氨合成中,将刚性长链聚胺酸 (PAA) 作为链延长剂加入.
- 利用金属协调引入动态交叉连接点并增强材料性能.
- 机械性能,相位过渡温度,自我愈合,可回收性和粘附性质的表征.
主要成果:
- 开发的PU-PAA表现出50°C的相位过渡温度和卓越的机械性能.
- 刚性PAA段和-COOH组促进了结,π-π结合,物理交联和微相分离.
- PU-PAA 证明了自我愈合,溶剂可回收利用性和对金属的显著粘附性.
- PU-PAA-Eu显示出优异的形状固定/恢复和光,这是由于协调相互作用.
结论:
- 使用刚性聚胺酸和金属协调的策略有效地提高了SMPU的性能.
- 由此产生的SMPU具有理想的相位过渡温度,强大的机械性能和功能特征,如自我愈合和金属粘附.
- 这项研究为开发高性能SMPU提供了有前途的途径,在防伪涂料等领域具有潜在的应用.
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