Journal
POLYMER
Volume 214, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2020.123261
Keywords
Polyurethane; Self-healing; Disulfide metathesis; Near body temperature
Categories
Funding
- National Key Research and Development Program of China [YFB1802300]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDA17020302]
- Youth Innovation Promotion Association, CAS [2019229]
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The study developed a thermoplastic polyurethane material with excellent mechanical properties and the ability to recover quickly at 40 degrees Celsius within 2 hours. The material contains two different isocyanate structures, allowing it to have good mechanical properties while being able to be quickly repaired under mild conditions.
It is necessary to develop polymer materials with excellent mechanical properties and can be quickly repaired under reasonable conditions. However, it is difficult to simultaneously optimize the mechanical properties and repair conditions as they have conflicting realization requirements. In this study, we prepare a thermoplastic polyurethane (I-4-P-HM) containing two kinds of alicyclic isocyanate with a tensile strength and toughness of 11.35 MPa and 64.1 MJ m(-3), respectively. The mechanical properties of the cut and spliced I-4-P-HM films can be completely restored to their original values at near body temperature (40 degrees C) in only 2 h. In I-4-P-HM, isophorone diisocyanate (IPDI) directly connect to aromatic disulfide that enables a more efficient exchange of the aromatic disulfides, while dicyclohexylmethane 4,4 '-diisocyanate (HMDI) with a symmetrical alicyclic structure endows the TPU with better mechanical properties. The two work together to make polyurethane have good mechanical properties and can be repaired quickly under mild condition. Furthermore, we carried out the scratch recovery experiments on I-4-P-HM covered with a layer of conductive silver paste, and the results indicate that this TPU has the potential to be applied in the flexible electronics industry.
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