Platonova Elena, Chechenov Islam, Pavlov Alexander, Solodilov Vitaliy, Afanasyev Egor, Shapagin Alexey, Polezhaev Alexander
Laboratory of Functional Composite Materials, Bauman Moscow State Technical University, 2nd Baumanskaya str., 5/1, 105005 Moscow, Russia.
Laboratory for Nuclear Magnetic Resonance, A.N. Nesmeyanov Institute of Organoelement Compounds, Vavilova str., 28, 119334 Moscow, Russia.
Polymers (Basel). 2021 Jun 10;13(12):1935. doi: 10.3390/polym13121935.
We prepared a series of thermally remendable and recyclable polyurethanes crosslinked via reversible furan-maleimide Diels-Alder reaction based on TDI end-caped branched Voranol 3138 terminated with difurfurylamine and 4,4'-bis(maleimido)diphenylmethane (BMI). We showed that Young modulus strongly depends on BMI content (from 8 to 250 MPa) that allows us to obtain materials of different elasticity as simple as varying BMI content. The ability of DA and retro-DA reactions between furan and maleimide to reversibly bind material components was investigated by NMR spectroscopy, differential scanning calorimetry, and recycle testing. All polymers obtained demonstrated high strengths and could be recovering without significant loss in mechanical properties for at least five reprocessing cycles.
我们基于用二糠胺和4,4'-双（马来酰亚胺）二苯甲烷（BMI）封端的甲苯二异氰酸酯（TDI）封端的支化Voranol 3138，制备了一系列通过可逆的呋喃-马来酰亚胺狄尔斯-阿尔德反应交联的可热修复和可回收的聚氨酯。我们表明，杨氏模量强烈依赖于BMI含量（从8到250兆帕），这使我们能够通过简单地改变BMI含量来获得具有不同弹性的材料。通过核磁共振光谱、差示扫描量热法和循环测试研究了呋喃和马来酰亚胺之间的狄尔斯-阿尔德反应和逆狄尔斯-阿尔德反应使材料组分可逆结合的能力。所有得到的聚合物都表现出高强度，并且在至少五个再加工循环中能够回收而不会有显著的机械性能损失。
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