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Photoactive Fluorinated Poly(azomethine)s with Azo Groups in the Main Chain for Optical Storage Applications and Controlling Liquid Crystal Orientation
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2019-12-06 , DOI: 10.1021/acsapm.9b00906 Andrii I. Kovalchuk 1 , Yaroslav L. Kobzar 1 , Ihor M. Tkachenko 1 , Yuriy I. Kurioz 2 , Olexsandr G. Tereshchenko 2 , Oleg V. Shekera 1 , Vassili G. Nazarenko 2 , Valery V. Shevchenko 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2019-12-06 , DOI: 10.1021/acsapm.9b00906 Andrii I. Kovalchuk 1 , Yaroslav L. Kobzar 1 , Ihor M. Tkachenko 1 , Yuriy I. Kurioz 2 , Olexsandr G. Tereshchenko 2 , Oleg V. Shekera 1 , Vassili G. Nazarenko 2 , Valery V. Shevchenko 1
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Polymer multicomponent materials containing conjugated fragments (such as azo- or azomethine groups) have attracted significant attention due to their possible use in the efficient reversible stimuli-responsive, light-responsive devices. Light-responsive polyazomethines with azo groups in the backbone (Azo-Pams) are synthesized by polycondensation of tetrafluorobenzene- or octafluorobiphenylene-based bis-hydroxybenzaldehydes with hexamethylenediamine. The polymers feature the simultaneous combination of azo and azomethine groups inside one conjugated block. The synthesized polymers can be solution cast into flexible solid films with tensile strength of about 24 MPa. We found that the obtained Azo-Pam polymers have an amorphous structure (Tg ∼ 134 °C) and high thermal stability (up to 300 °C). Their optical spectra depend on the solvent type and its pH which influence the dynamical equilibrium between the tautomeric forms. It also determines the balance between the main (azo form) and the ionized form in the solvent and allows to purposefully regulate the absorption maxima. We demonstrate the ability to record optical information using Azo-Pam films in the form of polarization gratings (holograms) with a regulated diffraction efficiency. A uniform orientation of liquid crystal is achieved by a polarized UV irradiation of glass substrates covered with the polymer Azo-Pam-II. The obtained data show that the synthesis strategy of the Azo-Pam polymers is an effective instrument for designing a wide range of stimuli-responsive and optical active materials.
中文翻译：
主链上具有偶氮基的光敏氟化聚偶氮甲胺，用于光学存储应用和控制液晶取向
包含共轭片段（如偶氮或偶氮甲碱基团）的聚合物多组分材料因其可用于有效的可逆刺激响应，光响应设备而备受关注。通过在四氟苯或八氟联苯基的双羟基苯甲醛与六亚甲基二胺的缩聚反应中合成在主链中具有偶氮基的光响应性聚偶氮次甲基（Azo-Pams）。该聚合物具有一个共轭嵌段内偶氮基和偶氮甲碱基团的同时结合的特点。可以将合成的聚合物溶液流延成具有约24MPa的拉伸强度的柔性固体膜。我们发现，所获得的Azo-Pam聚合物具有无定形结构（T g约134°C）和高热稳定性（最高300°C）。它们的光谱取决于溶剂类型及其pH，溶剂类型和pH影响互变异构形式之间的动态平衡。它还可以确定溶剂中主要（偶氮形式）和离子化形式之间的平衡，并可以有目的地调节吸收最大值。我们展示了使用偏振光栅（全息图）形式的Azo-Pam膜以可调节的衍射效率记录光学信息的能力。液晶的均匀取向是通过对用聚合物Azo-Pam-II覆盖的玻璃基板进行偏振UV辐照来实现的。获得的数据表明，Azo-Pam聚合物的合成策略是设计多种刺激响应性和光学活性材料的有效手段。
更新日期：2019-12-06
中文翻译：
主链上具有偶氮基的光敏氟化聚偶氮甲胺，用于光学存储应用和控制液晶取向
包含共轭片段（如偶氮或偶氮甲碱基团）的聚合物多组分材料因其可用于有效的可逆刺激响应，光响应设备而备受关注。通过在四氟苯或八氟联苯基的双羟基苯甲醛与六亚甲基二胺的缩聚反应中合成在主链中具有偶氮基的光响应性聚偶氮次甲基（Azo-Pams）。该聚合物具有一个共轭嵌段内偶氮基和偶氮甲碱基团的同时结合的特点。可以将合成的聚合物溶液流延成具有约24MPa的拉伸强度的柔性固体膜。我们发现，所获得的Azo-Pam聚合物具有无定形结构（T g约134°C）和高热稳定性（最高300°C）。它们的光谱取决于溶剂类型及其pH，溶剂类型和pH影响互变异构形式之间的动态平衡。它还可以确定溶剂中主要（偶氮形式）和离子化形式之间的平衡，并可以有目的地调节吸收最大值。我们展示了使用偏振光栅（全息图）形式的Azo-Pam膜以可调节的衍射效率记录光学信息的能力。液晶的均匀取向是通过对用聚合物Azo-Pam-II覆盖的玻璃基板进行偏振UV辐照来实现的。获得的数据表明，Azo-Pam聚合物的合成策略是设计多种刺激响应性和光学活性材料的有效手段。
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