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Reversible Actuation via Photoisomerization-Induced Melting of a Semicrystalline Poly(Azobenzene)
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-06-04 , DOI: 10.1021/acsmacrolett.0c00328
Alexa S Kuenstler 1 , Kyle D Clark 2 , Javier Read de Alaniz 2 , Ryan C Hayward 1
Affiliation  

Photoisomerization of azobenzene in polymer matrices is a powerful method to convert photon energy into mechanical work. While most previous studies have focused on incorporating azobenzene within amorphous or liquid crystalline materials, the limited extents of molecular ordering and correspondingly modest enthalpy changes upon switching in such systems has limited the achievable energy densities. In this work, we introduce a semicrystalline main-chain poly(azobenzene), where photoisomerization is capable of reversibly triggering melting and recrystallization under essentially isothermal conditions. These materials can be drawn into aligned fibers, yielding optically driven two-way shape memory actuators capable of reversible bending.

中文翻译:

通过光异构化诱导的半结晶多(偶氮苯)熔化的可逆驱动

聚合物基质中偶氮苯的光异构化是将光子能转化为机械功的有效方法。虽然大多数先前的研究都集中在将偶氮苯掺入无定形或液晶材料中,但在此类系统中切换时分子有序度的有限程度和相应的适度焓变化限制了可实现的能量密度。在这项工作中,我们介绍了一种半结晶主链聚(偶氮苯),其中光异构化能够在基本等温条件下可逆地触发熔化和重结晶。这些材料可以被拉成对齐的纤维,产生能够可逆弯曲的光学驱动双向形状记忆致动器。
更新日期:2020-06-04
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