"All-weather" Self-healing Polyurethane with High Strength and Toughness Based on Heterojunction Nanocrystals and Multi-level Dynamic Bonds

Chen-yang Guo; Hao-ran Chen; Ran Li; Kai-ge Jiao; Jin-cheng Zhao; Yan-hua Liu; Jian-bin Zhang; Li-bang Feng

doi:10.11777/j.issn1000-3304.2026.26008

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"All-weather" Self-healing Polyurethane with High Strength and Toughness Based on Heterojunction Nanocrystals and Multi-level Dynamic Bonds

更新时间：2026-03-24

- "All-weather" Self-healing Polyurethane with High Strength and Toughness Based on Heterojunction Nanocrystals and Multi-level Dynamic Bonds
- Acta Polymerica Sinica Pages: 1-13(2026)
- 作者机构：
  
  兰州交通大学材料科学与工程学院兰州 730070
- 作者简介：
  
  Li-bang Feng, E-mail: fenglb@lzjtu.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.26008
  CLC：
- CSTR：32057.14.GFZXB.2026.7561
- Received：07 January 2026，
  
  Accepted：09 February 2026，
  
  Online First：24 March 2026，
- 稿件说明：
移动端阅览
郭晨阳, 陈浩然, 李冉, 焦凯歌, 赵锦程, 刘艳花, 张建斌, 冯利邦. 基于异质结纳米晶与多层级动态键的高强高韧、全天候自修复聚氨酯. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26008.

Guo, C. Y.; Chen, H. R.; Li, R.; Jiao, K. G.; Zhao, J. C.; Liu, Y. H.; Zhang, J. B.; Feng, L. B. "All-weather" self-healing polyurethane with high strength and toughness based on heterojunction nanocrystals and multi-level dynamic bonds. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26008.
郭晨阳, 陈浩然, 李冉, 焦凯歌, 赵锦程, 刘艳花, 张建斌, 冯利邦. 基于异质结纳米晶与多层级动态键的高强高韧、全天候自修复聚氨酯. 高分子学报, doi: 10.11777/j.issn1000-3304.2026.26008. DOI： CSTR： 32057.14.GFZXB.2026.7561.

Guo, C. Y.; Chen, H. R.; Li, R.; Jiao, K. G.; Zhao, J. C.; Liu, Y. H.; Zhang, J. B.; Feng, L. B. "All-weather" self-healing polyurethane with high strength and toughness based on heterojunction nanocrystals and multi-level dynamic bonds. Acta Polymerica Sinica (in Chinese), doi: 10.11777/j.issn1000-3304.2026.26008. DOI： CSTR： 32057.14.GFZXB.2026.7561.

摘要

针对自修复材料在实际应用中面临的环境适应性有限与强度和韧性难以兼顾的问题，设计合成了一种基于异质结纳米晶与多层级动态键协同作用的高强高韧自修复聚氨酯. 通过将TiO

/CuS异质结纳米晶引入基于肟氨酯键的聚氨酯中，成功构建了一种具有多重响应自修复能力的弹性体材料. 得益于“多重动态网络”与“异质结的宽光谱响应”的耦合，该材料不仅表现出优异的力学性能，还可在热、紫外光、近红外光及模拟太阳光激发下实现损伤高效自修复. 同时，户外实际环境实验表明，材料表面的损伤在自然阳光下40 min内即可实现自修复(修复效率高达96.1%)，在同一部位经过3次损伤与光照循环后，修复效率仍高达92.2%以上. 因此，本工作开发的材料可灵活应对晴天、阴天、雨雪等不同天气和环境，具有“全天候”环境适应性，为开发适合实际应用的高性能自修复材料提供了可行的理论依据和实践路径.

Abstract

Based on heterojunction nanocrystals and multilevel dynamic bonds

a self-healing polyurethane with both high strength and toughness was designed and synthesized to address the limited environmental adaptability and difficulty in balancing strength and toughness of conventional self-healing materials in practical applications. A multi-responsive self-healing elastomer was successfully developed by introducing TiO

/CuS heterojunction nanocrystals into an oxime-urethane bond-based polyurethane matrix. Benefiting from the coupling effect between multiple dynamic networks and heterojunction-induced broad-spectrum response

the resulting material exhibited outstanding mechanical properties

including a tensile strength of 28.43 MPa

an elongation at break of 1755%

and a toughness of 261.7 MJ/m

. Moreover

damage can be healed efficiently with diverse external stimuli

such as thermal treatment

ultraviolet light

near-infrared light

and simulated sunlight. Field experiments in real outdoor environments showed that surface damage could be effectively repaired within 40 min under sunlight irradiation

achieving a healing efficiency of up to 96.1%. Notably

the material maintained a high healing efficiency of 92.2% even after three consecutive damage-healing cycles at the same site. Therefore

the materials developed in this study have all-weather environmental adaptability and can flexibly adapt to various weather conditions

including sunny

cloudy

rainy

and snowy environments. This study provides a feasible theoretical basis and practical pathway for the development of high-performance s

elf-healing materials suitable for real-world applications.

关键词

Keywords

references

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