摘要
Holographic polymer/liquid-crystal composites,which are periodically ordered materials with alternative polymer-rich and liquid-crystal-rich phases, have drawn increasing interest due to their unique capabilities of reconstructing colored three-dimensional(3 D) images and enabling the electro-optic response. They are formed via photopolymerization induced phase separation upon exposure to laser interference patterns, where a fast photopolymerization is required to facilitate the holographic patterning. Yet, the fast photopolymerization generally leads to depressed phase separation and it remains challenging to boost the holographic performance via kinetics control.Herein, we disclose that the ketyl radical inhibition is able to significantly boost the phase separation and holographic performance by preventing the proliferated diffusion of initiating radicals from the constructive to the destructive regions. Dramatically depressed phase separation is caused when converting the inhibiting ketyl radical to a new initiating radical, indicating the significance of ketyl radical inhibition when designing high performance holographic polymer composites.
全息聚合物/液晶复合材料是由富聚合物相与富液晶相周期性排列而成的结构有序复合材料,不仅具有独特的彩色3D图像存储功能,还具有电光响应特性,因此获得了广泛关注.全息聚合物/液晶复合材料通过激光相干下的光聚合诱导相分离原位形成.高的光聚合反应速率有利于全息加工,但往往会抑制相分离.因此,发展新的动力学调控策略以提升全息聚合物/液晶复合材料的性能仍是一个挑战.本研究发现,羰基自由基阻聚可抑制引发自由基从相干亮区向相干暗区的传递,进而显著提高相分离程度和全息性能.消除羰基自由基导致全息聚合物/液晶复合材料性能下降,也证实了羰基自由基阻聚在设计高性能全息聚合物/液晶复合材料中的重要性.
作者
Xiaoyu Zhao
Shanshan Sun
Ye Zhao
Rong-Zhen Liao
Ming-De Li
Yonggui Liao
Haiyan Peng
Xiaolin Xie
赵骁宇;孙姗姗;赵晔;廖荣臻;李明德;廖永贵;彭海炎;解孝林(Key Lab for Material Chemistry of Energy Conversion and Storage,Ministry of Education,School of Chemistry and Chemical Engineering,and National Anti-Counterfeit Engineering Research Center,Huazhong University of Science and Technology(HUST),Wuhan 430074,China;Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province,Shantou University(STU),Shantou 515063,China)
基金
financial supports from the National Natural Science Foundation of China (51433002 and 51773073)
HUST peak boarding program
the National Science Foundation (NSF) of Hubei Scientific Committee (2016CFA001)
the Fundamental Research Funds for the Central Universities (2019kfy RCPY089)
