Mechanochromic Dynamic Covalent Elastomers: Quantitative Stress Evaluation and Autonomous Recovery,ACS Macro Letters

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Mechanochromic Dynamic Covalent Elastomers: Quantitative Stress Evaluation and Autonomous Recovery
ACS Macro Letters ( IF 5.1 ) Pub Date : 2015-11-09 00:00:00 , DOI: 10.1021/acsmacrolett.5b00717
Keiichi Imato _{1,

2,

3} , Takeshi Kanehara _{1,

2,

3} , Tomoyuki Ohishi _{1,

2,

3} , Masamichi Nishihara _{1,

2,

3} , Hirofumi Yajima _{1,

2,

3} , Masayoshi Ito _{1,

2,

3} , Atsushi Takahara _{1,

2,

3} , Hideyuki Otsuka _{1,

2,

3}

Affiliation

Stress evaluation in polymeric materials is important in order to not only spot danger in them before serious failure, but also precisely interpret the destructive mechanism, which can improve the lifetime and durability of polymeric materials. Here, we are able to visualize stress by color changes, as well as quantitatively estimate the stress in situ, in segmented polyurethane elastomers with diarylbibenzofuranone-based dynamic covalent mechanophores. We prepared films of the segmented polyurethanes, in which the mechanophores were incorporated in the soft segments, and efficiently activated them by mechanical force. Cleavage of the mechanophores during uniaxial elongation and their recovery after the removal of the stress were quantitatively evaluated by in situ electron paramagnetic resonance measurements, accompanied by drastic color changes.

中文翻译：

机械变色动态共价弹性体：定量应力评估和自主恢复

聚合物材料的应力评估非常重要，不仅可以在严重失效之前发现其中的危险，还可以准确解释破坏机制，从而提高聚合物材料的寿命和耐久性。在这里，我们能够通过颜色变化来可视化应力，以及在具有二芳基二苯并呋喃酮基动态共价机械载体的分段聚氨酯弹性体中原位定量估计应力。我们制备了分段聚氨酯薄膜，其中机械载体结合到软链段中，并通过机械力有效地激活它们。通过原位电子顺磁共振测量定量评估单轴伸长过程中机械载体的解理及其在去除应力后的恢复，并伴有剧烈的颜色变化。

更新日期：2015-11-09

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