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Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites

羰基自由基对全息聚合物/液晶复合材料结构及性能的影响

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Abstract

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 (3D) 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.

摘要

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.

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Acknowledgements

We thank the 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) and the Fundamental Research Funds for the Central Universities (2019kfyRCPY089). We also thank the technical assistance from HUST Analytical & Testing Center.

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Authors and Affiliations

  1. 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

    Xiaoyu Zhao  (赵骁宇), Ye Zhao  (赵晔), Rong-Zhen Liao  (廖荣臻), Yonggui Liao  (廖永贵), Haiyan Peng  (彭海炎) & Xiaolin Xie  (解孝林)

  2. Department of Chemistry and Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province, Shantou University (STU), Shantou, 515063, China

    Shanshan Sun  (孙姗姗) & Ming-De Li  (李明德)

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  1. Xiaoyu Zhao  (赵骁宇)
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  2. Shanshan Sun  (孙姗姗)
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  3. Ye Zhao  (赵晔)
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  6. Yonggui Liao  (廖永贵)
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  7. Haiyan Peng  (彭海炎)
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  8. Xiaolin Xie  (解孝林)
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Contributions

Author contributions Li MD, Xie X and Peng H gave the direction of the experiments; Zhao X and Sun S conducted the experiments together; Zhao Y participated in the discussion; Liao RZ obtained the DFT calculation results; Liao Y gave suggestions to the experiments and revised the manuscript with Peng H.

Corresponding authors

Correspondence to Ming-De Li  (李明德) or Haiyan Peng  (彭海炎).

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Conflict of interest The authors declare no competing financial interest.

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Xiaoyu Zhao received his Master’s degree from Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences in 2016. He is now a PhD candidate at Huazhong University of Science and Technology (HUST) under the supervision of Prof. Xiaolin Xie and Prof. Haiyan Peng. His current interest focuses on photopolymerization mechanism and applications.

Ming-De Li obtained his PhD degree at the University of Hong Kong in 2012. Then he conducted his postdoctoral research at the University of California, Berkeley and The University of Hong Kong. Now, he is a professor at Shantou University. His current interest is in the ultrafast laser spectroscopies.

Haiyan Peng received his PhD degree from HUST in 2014. He visited the University of Colorado Boulder from 2012 to 2014, sponsored by the CSC. Then he did research as an Assistant Professor at Guangzhou Institute of Advanced Technology, Chinese Academy of Sciences, and conducted postdoctoral research at City University of Hong Kong. He has been an Associate Professor at HUST since 2016.

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Zhao, X., Sun, S., Zhao, Y. et al. Effect of ketyl radical on the structure and performance of holographic polymer/liquid-crystal composites. Sci. China Mater. 62, 1921–1933 (2019). https://doi.org/10.1007/s40843-019-9580-y

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