Super‐Tough, Self‐Healing Polyurethane Based on Diels‐Alder Bonds and Dynamic Zinc–Ligand Interactions. Issue 6 (7th May 2020)

• Record Type: Journal Article
• Authors: Ouyang, Chunfa; Zhao, Chao; Li, Wei; Wu, Xiuchun; Le, Xiaoxia; Chen, Tao; Huang, Wei; Gao, Qun; Shan, Xiaoqian; Zhg, Rei; Zhang, Weiping
• Is Part Of: Macromolecular materials and engineering. Volume 305:Issue 6(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-05-07
• Subjects: Diels–Alder reactions -- polyurethane -- self‐healing -- zinc–ligand interactions; Plastics -- Periodicals; Polymers -- Periodicals; Polymerization -- Periodicals; 547.705
• DOI: 10.1002/mame.202000089
• Languages: English
• ISSNs: 1438-7492

Abstract

Abstract: Self‐healing polymer materials have attracted extensive attention and have been explored due to their ability of crack repairing in materials. This paper aims to develop a novel polyurethane‐based material with high self‐healing efficiency and excellent mechanical properties under 80 °C on the basis of reversible Diels–Alder bonds as well as zinc–ligand structure (DA‐ZN‐PU). By integrating DA bonds and zinc–ligand structure, as‐prepared DA‐ZN‐PU samples reach the maximum tensile strength as much as 28.45 MPa. After self‐healing, the tensile strength is 25.85 MPa, leading to the high self‐healing efficiency of 90.8%. In addition, by introducing carbonyl iron powder (CIP), a new polyurethane containing carbonyl iron powder (DA‐ZN‐CIP‐PU) can be achieved, exhibiting microwave‐assisted self‐healing property. And the self‐healing efficiency can be reached to 92.6% in 3 min. Due to high self‐healing efficiency and excellent mechanical properties of the prepared novel polyurethane, it has application attributes in crack repair of functional composite materials. Abstract : The DA group on a polymer is decomposed into maleimide and furan groups when the temperature rises. Maleimide and furan groups are randomly recombined in the polymer with the synergistic attraction of Zn ligand and hydrogen bond, which make the polymer realize the characteristic of self‐healing by heating .