Journal
POLYMER
Volume 151, Issue -, Pages 27-33Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2018.07.047
Keywords
Polysulfide; Polyurethane; Self-healing; Reprocessing; Disulfide metathesis
Categories
Funding
- Nanjing University Innovation and Creative Program
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Polyurethanes are known for their satisfactory mechanical strength, which is highly desired for various applications. Poly (ethyl formal disulfide)-based materials have excellent self-healing ability because of containing abundant exchangeable disulfide bonds, while their strength is relatively low (<0.8 MPa). Combining the advantages of the two materials, in this article, we synthesized self-healable polysulfide-based polyurethanes with a tensile strength of 2.62-5.80 MPa. After healing at 75 degrees C for 24 h or 100 degrees C for 4 h, the tensile strength of a fully cut optimized sample (PSPU-15) recovered to 90.8 and 93.1% of the original value 2.62 MPa, respectively, with the damaged incision disappearing and the sealing integrity fully recovered. Furthermore, the sample PSPU-15 possessed good reprocessing ability, retaining the tensile strength of 2.66-2.40 MPa after repeated processing. These outcomes indicated that polysulfidebased polyurethane is an attractive paradigm towards sustainable industrial applications. (C) 2018 Elsevier Ltd. All rights reserved.
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