Blending to Make Nonhealable Polymers Healable: Nanophase Separation Observed by CP/MAS 13C NMR Analysis
Blending to Make Nonhealable Polymers Healable: Nanophase Separation Observed by CP/MAS 13C NMR Analysis
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通过混合使不可修复的聚合物变得可修复：通过 CP/MAS 13C NMR 分析观察纳米相分离
DOI：
10.1002/anie.202214444
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Takuzo Aida
中科院分区：
文献类型：
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作者：
Yuta Fujisawa;Yiling Nan;Atsushi Asano;Yu Yanagisawa;Keiichi Yano;Yoshimitsu Itoh;Takuzo Aida
商品聚合物仅仅通过与自愈聚合物混合就能制成可治愈的聚合物吗？在这里，我们报告了关于这一具有实际挑战性的问题的基本方面的第一次研究。2018年报道的聚醚硫脲(PTUEG3；Tg=27 °C)的不同寻常之处在于，它的机械强度很高，但即使在12 °C下也可以自愈。相比之下，PTUEG3的类似物聚八亚甲基硫脲(PTUC8；Tg=50 °C)在92 °C以下不能自愈。我们发现，即使PTUEG3的含量只有20 °C，它们的聚合物共混物也不能在32 °C以上的温度范围内自愈。与PTUEG3不同，这种聚合物混合物暴露在高湿度下几乎不会增塑，由于PTUC8组分的非吸湿性，它保持了优异的机械性能。CP/MAS13C核磁共振分析表明，聚合物共混物是纳米相分离的，这可能解释了为什么如此少量的PTUEG3使聚合物共混物具有耐湿自愈性能。
Can commodity polymers are made to be healable just by blending with self‐healable polymers? Here we report the first study on the fundamental aspect of this practically challenging issue. Poly(ether thiourea) (PTUEG3;Tg=27 °C) reported in 2018 is extraordinary in that it is mechanically robust but can self‐heal even at 12 °C. In contrast, poly(octamethylene thiourea) (PTUC8;Tg=50 °C), an analogue of PTUEG3, cannot heal below 92 °C. We found that their polymer blend self‐healed in a temperature range above 32 °C even when its PTUEG3content was only 20 mol %. Unlike PTUEG3alone, this polymer blend, upon exposure to high humidity, barely plasticized, keeping its excellent mechanical properties due to the non‐hygroscopic nature of the PTUC8component. CP/MAS13C NMR analysis revealed that the polymer blend was nanophase‐separated, which possibly accounts for why such a small amount of PTUEG3provided the polymer blend with humidity‐tolerant self‐healable properties.