Citation: Li-rong Tian, Li Yang, Zhan-hua Wang, He-sheng Xia. Room-temperature Self-healable and Reprocessable Polyurethane Elastomers Combined Diels-Alder Bond and Disulfide Bond[J]. Acta Polymerica Sinica, ;2019, 50(5): 527-534. doi: 10.11777/j.issn1000-3304.2019.19021 shu

Room-temperature Self-healable and Reprocessable Polyurethane Elastomers Combined Diels-Alder Bond and Disulfide Bond

1.
State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065
2.
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610065

Corresponding author: Li Yang, yangli988@uesct.edu.cn Zhan-hua Wang, zhwangpoly@scu.edu.cn
Received Date: 28 January 2019
Revised Date: 1 March 2019
Available Online: 2 April 2019

We synthesized a self-healing polyurethane elastomer (PU-SSDA) which displayed excellent healing efficiency at room temperature due to the synergistic contribution of dynamic covalent D-A bond and S–S bond. Mechanical and self-healing properties of the polyurethane elastomers were characterized by tensile test and three-dimensional super depth of field microscope. The cross-linking structure of PU-SSDA is explored by extraction experiments, demonstrating that there are not only crosslinked structures but also linear molecular segments existed in the polyurethane elastomer. Mechanical properties of the PU-SSDA elastomer can be tuned by changing the cross-linking degree. As the crosslinking degree increases from 25% to 45%, the tensile strength increases from 2.9 MPa to 5.5 MPa while the elongation at break decreases from 795% to 304%. After optimization, when the crosslinking degree was 35%, the tensile strength was 3.7 MPa, the elongation at break was 606% and the repair efficiency could be restored to 93% after healing for 60 min at room temperature. Moreover, the healing efficiency still remains above 90% after 4 damage-healing cycles. In addition, the PU-SSDA elastomer can also be reprocessed by hot pressing at 120 °C. This excellent self-healing behavior and reprocessable property were attributed to the reversible fracture recombination reaction of dynamic D-A and S―S bonds and the quick infiltration of the linear polymer chains into damaged surface. The self-healing mechanism can be further confirmed by the dissolution experiments which showed that the PU-SSDA elastomer can be dissolved in DMF at 100 °C while the PU-control can only swell under the same conditions, demonstrating that the reversible cleavage and reformation of D-A and S―S bonds contribute a lot to the self-healing process. Due to the facile and friendly preparation method, fast self-healing behavior at room temperature and fully reprocessable properties, the as-prepared polyurethane elastomers displayed wide potential applications such as protection coatings and wearable electronic devices.
- D-A bond,
- S–S bond,
- Room-temperature self-healable,
- Reprocessable,
- Polyurethane
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沈阳化工大学材料科学与工程学院沈阳 110142