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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Synthesis, Characterization, and Study of Photoinduced Optical Anisotropy in Polyimides Containing Side Azobenzene Units
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Synthesis, Characterization, and Study of Photoinduced Optical Anisotropy in Polyimides Containing Side Azobenzene Units

机译：含侧氮杂苯单元的聚酰亚胺的光致光学各向异性的合成，表征和研究

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摘要

In this paper, novel processable aromatic polymers with imide rings and attached as side-chain azobenzene units are presented. Polymers differ in the chemical structures of chromophores and polymer backbones. Azopolymers were obtained by a two-step synthetic approach. This includes the preparation of a precursor poly(esterimide) and poly(etherimide) with pendant phenolic hydroxyl groups, followed by the covalent bonding of NLO chromophores onto the polyimide backbone by the Mitsunobu reaction. The degree of functionalization of polymers was estimated by UV-vis spectroscopy. Polymers were characterized and evaluated by FT-IR, 1H NMR, X-ray, UV-vis, DSC, and TGA methods. The synthesized polymers exhibited glass transition temperatures in the range of 167-228 °C, thermal stability with decomposition temperatures in the range of 275-446 °C, and excellent solubilities in common organic solvents. The light-induced optical anisotropy was studied in obtained azopolymers with the help of a holographic grating recording technique. Two polarization geometries were applied for the grating inscription s-s and p-p. The influence of the polarization geometry on the diffraction efficiency dynamics and on the depth of the surface modulation was not observed, which is different from results reported in the literature. Surface relief gratings, which appeared after the light exposure, were observed by atomic force microscopy. Additionally, the optical anisotropy in poly(esterimide)s was investigated by photoinduced birefringence measurements. For the first time, in polyimide with covalently bonded azobenzene derivatives, the high photoinduced birefringence (Δn ) 0.01) was measured.
机译：在本文中，提出了具有酰亚胺环并连接为侧链偶氮苯单元的新型可加工芳族聚合物。聚合物在生色团和聚合物主链的化学结构方面有所不同。偶氮聚合物通过两步合成方法获得。这包括制备具有侧链酚羟基的聚（酯酰亚胺）和聚（醚酰亚胺）前体，然后通过Mitsunobu反应将NLO生色团共价键合到聚酰亚胺主链上。聚合物的官能化程度通过紫外可见光谱法估计。通过FT-IR，1H NMR，X射线，UV-vis，DSC和TGA方法对聚合物进行表征和评估。合成的聚合物表现出的玻璃化转变温度在167-228°C范围内，热稳定性和分解温度在275-446°C范围内，并且在普通有机溶剂中具有出色的溶解性。借助全息光栅记录技术，在获得的偶氮聚合物中研究了光诱导的光学各向异性。光栅标记s-s和p-p应用了两种偏振几何。没有观察到偏振几何形状对衍射效率动力学和表面调制深度的影响，这与文献报道的结果不同。通过原子力显微镜观察曝光后出现的表面起伏光栅。另外，通过光致双折射测量研究了聚（亚乙基酰亚胺）中的光学各向异性。首次在具有共价键合的偶氮苯衍生物的聚酰亚胺中，测量到高的光致双折射（Δn）0.01）。

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