Photomechanical Deformation of Azobenzene-Functionalized Polyimides Synthesized with Bulky Substituents,ACS Macro Letters

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Photomechanical Deformation of Azobenzene-Functionalized Polyimides Synthesized with Bulky Substituents
ACS Macro Letters ( IF 5.1 ) Pub Date : 2017-12-06 00:00:00 , DOI: 10.1021/acsmacrolett.7b00854
Matthew L Baczkowski ₁ , David H Wang ₁ , Deborah H Lee ₁ , Kyung Min Lee ₁ , Matthew L Smith ₂ , Timothy J White ₁ , Loon-Seng Tan ₁

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Photomechanical effects realized in azobenzene-functionalized polyimides have shown large deformation and an exceptional increase in photogenerated force output. Here, we synthesize and characterize the photomechanical output of a series of linear polyimide materials prepared with a bulky substituent, incorporated via the development of a new bis(azobenzene-diamine) monomer containing a 9,9-diphenylfluorene cardo structure (azoCBODA). All six azoCBODA-containing polyimides are amorphous and exhibit high glass transition temperatures (T_g) ranging from 298 to 358 °C, storage moduli ranging from 2.27 to 3.81 GPa (at 30 °C), and good thermal stability. The magnitude of the photoinduced mechanical response of the azobenzene-functionalized polyimide is correlated to the rotational freedom of the polyimide chains (resulting in extensive segmental mobility) and fractional free volume (FFV > 0.1).

中文翻译：

大取代基合成偶氮苯官能化聚酰亚胺的光机械变形

在偶氮苯官能化聚酰亚胺中实现的光机械效应显示出较大的变形和光生力输出的异常增加。在这里，我们合成并表征了一系列用庞大取代基制备的线性聚酰亚胺材料的光机械输出，这些材料是通过开发含有 9,9-二苯基芴卡多结构 (azoCBODA) 的新型双(偶氮苯-二胺) 单体来实现的。所有六种含 azoCBODA 的聚酰亚胺都是无定形的，并表现出高玻璃化转变温度₍Tg) 范围从 298 到 358 °C，存储模量范围从 2.27 到 3.81 GPa（在 30 °C），并且具有良好的热稳定性。偶氮苯官能化聚酰亚胺的光致机械响应的大小与聚酰亚胺链的旋转自由度（导致广泛的链段迁移率）和自由体积分数（FFV > 0.1）相关。

更新日期：2017-12-06

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