Journal
ADVANCES IN POLYMER TECHNOLOGY
Volume 37, Issue 6, Pages 1987-1993Publisher
WILEY
DOI: 10.1002/adv.21857
Keywords
cross-linked polyurethane; Diels-Alder reaction; reversible covalent bond; self-healing
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Funding
- National Natural Science Foundation of China [51103078]
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Polymer materials containing Diels-Alder (abbreviated DA) groups show good self-healing ability under certain conditions. In this study, the thermal reversible DA bond was introduced into polyurethane by the design of molecular chain to obtain the self-healing properties. The pre-polyurethane (HTK) end-capped with furan rings was synthesized by hexamethylene diisocyanate trimer and furfuryl alcohol firstly. Then, HTK was mixed with bismaleimide (BMI) to synthesize the cross-linked polyurethane HTK-PU. Finally, the properties of the HTK-PU were characterized. It can be observed from DSC that the DA reaction occurred at 76 degrees C and the r-DA reaction occurred at 109.5 degrees C. This cross-linked polyurethane shows a remarkable high hardness (shore D80). When preserved at 80 degrees C for 6 hr, the self-healing efficiency of the HTK-PU was 53.75% known from tensile test, and cracks on it virtually disappeared as observed from polarizing microscope (POM). When preserved at 80 degrees C for 12 hr, the self-healing efficiency was 67.56%.
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