Hu Po, Li Jinhong, Jin Junchao, Lin Xiao, Tan Xiaodi
College of Photonic and Electronic Engineering, Fujian Normal University, Fuzhou 350117, China.
Henan Provincial Key Laboratory of intelligent lighting, Huanghuai University, Zhumadian 463000, China.
ACS Appl Mater Interfaces. 2022 May 11;14(18):21544-21554. doi: 10.1021/acsami.2c04011. Epub 2022 Apr 29.
Herein, via introducing eight methacryl polyhedral oligomeric silsesquioxane (Ma-POSS), we dramatically enhance the holographic performance of phenanthraquinone-doped poly(methyl methacrylate) (PQ/PMMA) photopolymer with excellent characteristics of high sensitivity, high diffraction efficiency, and neglectable volume shrinkage for holographic data storage, the photosensitivity, diffraction efficiency, and volume shrinkage reaching 1.47 cm/J, ∼75%, and ∼0.09%, respectively. Ma-POSS here dramatically enhances the photosensitivity ∼5.5 times, diffraction efficiency more than 50%, and suppressed the volume shrinkage over 4 times. Further analysis reveals that Ma-POSS obviously increased the molecular weight by grafting PMMA to be a star-shaped macromolecule. And the residual C═C of POSS-PMMA dramatically increased the photosensitivity. Moreover, the star-shaped POSS-PMMA acting as a plasticizer dramatically enhances the mechanical properties and so reduces the photoinduced volume shrinkage of PQ/PMMA. Finally, by the use of the POSS-PMMA/PQ in a collinear holography system, it appeared to be promising for a fast but low bit error rate in holographic information storage. The current study thence has not only successfully synthesized photopolymer materials with potential for highly sensitive holographic storage applications but also investigated the microphysical mechanism of the impact of Ma-POSS on the holographic properties of PQ/PMMA photopolymer and clarified the thermal- and photoreaction processes of the POSS-PMMA/PQ photopolymer.
在此，通过引入八种甲基丙烯酸多面体低聚倍半硅氧烷（Ma-POSS），我们显著提高了菲醌掺杂的聚甲基丙烯酸甲酯（PQ/PMMA）光聚合物的全息性能，该聚合物具有高灵敏度、高衍射效率以及用于全息数据存储时可忽略不计的体积收缩等优异特性，其感光度、衍射效率和体积收缩率分别达到1.47 cm/J、约75%和约0.09%。此处的Ma-POSS显著提高了感光度约5.5倍、衍射效率超过50%，并将体积收缩抑制了4倍以上。进一步分析表明，Ma-POSS通过接枝PMMA显著增加了分子量，使其成为星形大分子。并且POSS-PMMA的残余C═C显著提高了感光度。此外，星形的POSS-PMMA作为增塑剂显著增强了机械性能，从而降低了PQ/PMMA的光致体积收缩。最后，通过在共线全息系统中使用POSS-PMMA/PQ，其在全息信息存储中表现出快速且误码率低的前景。因此，当前的研究不仅成功合成了具有高灵敏度全息存储应用潜力的光聚合物材料，还研究了Ma-POSS对PQ/PMMA光聚合物全息性能影响的微观物理机制，并阐明了POSS-PMMA/PQ光聚合物的热反应和光反应过程。
