Tkachenko Ihor M, Kurioz Yuriy I, Kravchuk Ruslan M, Kobzar Yaroslav L, Litoshenko Dmytro V, Glushchenko Anatoliy V, Shevchenko Valery V, Nazarenko Vassili G
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, Kharkivske Shosse 48, Kyiv 02160, Ukraine.
Institute of Physics, National Academy of Sciences of Ukraine, Prospect Nauky 46, Kyiv 03028, Ukraine.
ACS Appl Mater Interfaces. 2024 Oct 2;16(39):52945-52957. doi: 10.1021/acsami.4c11876. Epub 2024 Sep 17.
In this paper, we give an overview of novel main-chain azobenzene-based fluorinated poly(arylene ether)s with different content of azo groups, aiming at providing a better understanding of the link between a number of N═N bonds and the macroscopic response of the material. We discuss chemical synthesis and molecular structure and report on a comprehensive analysis of the polymer properties, thermal behavior, and mechanical strength. We show that a higher content of azobenzene moieties reduces the mechanical strength of the polymer materials. On the other hand, polymers with a higher content of azobenzene demonstrate higher values of induced birefringence due to a larger number of azobenzene in the form. The photoisomerization constants of all polymers fall within a very close range. The minor variations are attributed to the number of azobenzene groups in the polymer composition and the conformational arrangements of the polymer chain packing. The developed light-sensitive polymers were employed for dynamic control and manipulation of the liquid crystal orientation by polarization of the incident light. After the double irradiation of the substrates using appropriate photomasks, we made patterned cells that consist of domains with different high-resolution liquid crystal director orientations.
在本文中，我们概述了具有不同偶氮基团含量的新型主链偶氮苯基氟化聚（亚芳基醚），旨在更好地理解N═N键的数量与材料宏观响应之间的联系。我们讨论了化学合成和分子结构，并报告了对聚合物性能、热行为和机械强度的综合分析。我们表明，较高含量的偶氮苯部分会降低聚合物材料的机械强度。另一方面，偶氮苯含量较高的聚合物由于有更多形式的偶氮苯，表现出更高的诱导双折射值。所有聚合物的光异构化常数都在非常接近的范围内。微小的变化归因于聚合物组成中偶氮苯基团的数量以及聚合物链堆积的构象排列。所开发的光敏聚合物用于通过入射光的偏振对液晶取向进行动态控制和操纵。使用适当的光掩模对基板进行两次照射后，我们制作了由具有不同高分辨率液晶指向矢取向域组成的图案化单元。
