Foelen Yari, van Gils Nieké J M, Claessen Mart D T, Schenning Albertus P H J
Stimuli-responsive Functional Materials and Devices, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.
Institute for Complex Molecular Systems, Eindhoven University of Technology, Den Dolech 2, 5600 MB, Eindhoven, The Netherlands.
Chem Commun (Camb). 2022 Sep 27;58(77):10833-10836. doi: 10.1039/d2cc04050f.
The UV intensity during photopolymerization allows control over the structural color of a cholesteric liquid crystal (CLC) polymer photonic coating in a single step. Simultaneously, the glass transition temperature () of the polymer can be tuned by the applied UV intensity. Most likely the low intensity photopolymerization increases the inhibition time, leading to formation of polymer fragments through oxygen inhibition. The formation of polymer fragments changes the matrix during the inhibition time, which results in a color change before the polymer network is formed. Additionally, these fragments inside the network act as a plasticizer, effectively lowering the . This method can be combined with temperature responsive properties based on shape memory to fabricate photonic coatings with multiple, responsive colored patterns. The presented work allows for new functionalities in responsive photonic polymers as multiple colors and response temperatures can be incorporated in a single polymerization step.
光聚合过程中的紫外线强度可在一步操作中控制胆甾相液晶（CLC）聚合物光子涂层的结构颜色。同时，聚合物的玻璃化转变温度（）可通过施加的紫外线强度进行调节。很可能低强度光聚合增加了抑制时间，导致通过氧抑制形成聚合物片段。聚合物片段的形成在抑制时间内改变了基质，这导致在聚合物网络形成之前颜色发生变化。此外，网络内的这些片段充当增塑剂，有效地降低了。该方法可与基于形状记忆的温度响应特性相结合，以制造具有多种响应颜色图案的光子涂层。所展示的工作为响应型光子聚合物带来了新功能，因为可以在单个聚合步骤中纳入多种颜色和响应温度。
