Role of Material Composition in Photothermal Actuation of DASABased Polymers
Role of Material Composition in Photothermal Actuation of DASABased Polymers
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材料成分在 DASA 基聚合物光热驱动中的作用
DOI：
10.1021/acsapm.1c01108
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发表时间：
2022
影响因子：
5
通讯作者：
Read de Alaniz, J.
中科院分区：
文献类型：
--
作者：
Sroda, M. M.;Lee, J.;Kwon, Y.;Stricker, F.;Park, M.;Valentine, M. T.;Read de Alaniz, J.
我们研究了基质对负光致变色、施主-受体-施主-受体加合物(DASA)基聚合物光热驱动性能的影响。使用模块化的Diels-Alder“Click”平台，我们设计了不同DASA掺杂量的聚合物材料，并研究了材料组成与所产生的物理、机械和光开关性能之间的关系。结果表明，随着DASA浓度的增加，材料的玻璃化转变温度(Tg)和弹性模量等物理力学性能以及光开关性能都发生了显著的变化，这些性能与Tg有很大的依赖关系。我们用一种简单的光敏双层膜证实了驱动性能是由双层膜的刚性控制的，而不是DASA的光致变色剂的掺入。最后，我们报道并比较了由开放形式和封闭形式的DASA组成的材料在Tg和弹性模量方面的光诱导性质变化。我们的结果证明了设计一种材料的重要性，这种材料足够坚硬，能够在负载下提供驱动所需的机械强度，但足够柔软，可以在工作温度下进行可逆开关，并为开发面向应用的光开关材料提供了关键考虑因素。
We investigate the influence of the host matrix on the photothermally driven actuation performance of negatively photochromic, donor–acceptor Stenhouse adduct (DASA)-based polymers. Using a modular Diels–Alder “click” platform, we designed polymeric materials with varying DASA incorporation and investigated the relationships between the material composition and the resulting physical, mechanical, and photoswitching properties. We demonstrate that increasing the DASA concentration in polymer conjugates has a dramatic effect on the material’s physical and mechanical properties, such as the glass transition temperature (Tg) and elastic modulus, as well as the photoswitching properties, which are found to be highly dependent onTg. We establish using a simple photoresponsive bilayer that actuation performance is controlled by the bilayer stiffness rather than the photochrome incorporation of DASA. Finally, we report and compare the light-induced property changes inTgand the elastic modulus between the materials comprising the open or closed forms of DASAs. Our results demonstrate the importance of designing a material that is stiff enough to provide the mechanical strength required for actuation under load, but soft enough to reversibly switch at the operational temperature and provide key considerations for the development of application-geared photoswitchable materials.