Healable, Recyclable, and Mechanically Tough Polyurethane Elastomers with Exceptional Damage Tolerance

被引:386
作者
Wang, Xiaohan [1 ]
Zhan, Shengnan [1 ]
Lu, Zhongyuan [1 ]
Li, Jian [1 ]
Yang, Xiao [2 ]
Qiao, Yongna [2 ]
Men, Yongfeng [2 ]
Sun, Junqi [1 ]
机构
[1] Jilin Univ, State Key Lab Supramol Struct & Mat, Coll Chem, Qianjin St 2699, Changchun 130012, Peoples R China
[2] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Renmin St 5625, Changchun 130022, Peoples R China
基金
中国国家自然科学基金;
关键词
damage tolerance; healable materials; polyurethane elastomers; recyclable materials; supramolecular chemistry; SACRIFICIAL BONDS; PERFORMANCE; RUBBER; POLYMER; TRANSPARENT; LINKING;
D O I
10.1002/adma.202005759
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
There is a huge requirement of elastomers for use in tires, seals, and shock absorbers every year worldwide. In view of a sustainable society, the next generation of elastomers is expected to combine outstanding healing, recycling, and damage-tolerant capacities with high strength, elasticity, and toughness. However, it remains challenging to fabricate such elastomers because the mechanisms for the properties mentioned above are mutually exclusive. Herein, the fabrication of healable, recyclable, and mechanically tough polyurethane (PU) elastomers with outstanding damage tolerance by coordination of multiblock polymers of poly(dimethylsiloxane) (PDMS)/polycaprolactone (PCL) containing hydrogen and coordination bonding motifs with Zn2+ ions is reported. The organization of bipyridine groups coordinated with Zn2+ ions, carbamate groups cross-linked with hydrogen bonds, and crystallized PCL segments generates phase-separated dynamic hierarchical domains. Serving as rigid nanofillers capable of deformation and disintegration under an external force, the dynamic hierarchical domains can strengthen the elastomers and significantly enhance their toughness and fracture energy. As a result, the elastomers exhibit a tensile strength of approximate to 52.4 MPa, a toughness of approximate to 363.8 MJ m(-3), and an exceptional fracture energy of approximate to 192.9 kJ m(-2). Furthermore, the elastomers can be conveniently healed and recycled to regain their original mechanical properties and integrity under heating.
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页数:8
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