期刊
PROGRESS IN ORGANIC COATINGS
卷 131, 期 -, 页码 131-136出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2019.02.021
关键词
UV-curable; Self-healing; Diels-Alder; Polyurethane; Thermal reversity
资金
- National Natural Science Foundation of China [51103069, 51463017]
- Natural Science Foundation of Jiangxi Province [20171BAB206019]
- Science Foundation of Aeronautics of China [2016ZF56022]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars [[2016]81]
- Department of Education fund of Jiangxi Province [GJJ170611]
- State Education Ministry and Scientific innovation fund of Nanchang Hang Kong University [YC2017001]
- Key Research and Development Plan of Jiangxi Province [2018188E58003]
A series of UV-curable polyurethanes were made by copolymerization of isocyanate monomers with various diols (PLA1000/PEG2000/HPDMS). The structure of the resulting polyurethanes with DA-generated bonds was characterized by Fourier transform infrared spectroscopy (FTIR) and H-1 NMR. In addition, the UV-curing behavior was studied by FTIR. Diels-Alder (DA) and retro-Diels-Alder (r-DA) reactions within cured films was monitored by differential scanning calorimeter (DSC) and dynamic mechanical analysis (DMA), which indicated that the cured film exhibited excellent thermal reversibility over at least three cycles. The resulting PU resins show different healing effect and PLAPU exhibited the most rapid thermal healing with the defect (a scratch with a width of 100 mu m) completely healed within 100 s at 120 degrees C. Furthermore, PLAPU has high tensile strength (3MPa) and robust hardness (H) at the same time which is an advantageous feature for applications in which extreme softening or reverse gelation of a self-healing coating would be unacceptable.
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