Creating Supramolecular Functional Materials via Nucleobase Interaction: Investigating Molecular Recognition and the Fabrication of Surface Relief Gratings

偶氮苯 材料科学 异构化 傅里叶变换红外光谱 聚合物 制作 超分子化学 玻璃化转变 光化学 化学工程 分子 化学 复合材料 有机化学 医学 替代医学 病理 工程类 催化作用
作者
Cheng-Wei Huang,Ling-Zheng Huang,Meng-Ting Hung,Mohamed Gamal Mohamed,Ahmed F. M. EL‐Mahdy,Shiao‐Wei Kuo
出处
期刊:ACS applied polymer materials [American Chemical Society]
卷期号:6 (1): 732-745 被引量:1
标识
DOI:10.1021/acsapm.3c02354
摘要

The development of photoresponsive materials with excellent thermal properties and high formability is crucial for expanding their range of applications and addressing various challenges. In this study, we successfully synthesized and investigated the stimuli-responsive polymer P(AZO-T-MA), which contains azobenzene and thymine functionalities in its side chains along with its precursor polymer P(AZO-N3-MA). The chemical structures of the materials were corroborated through characterization methods such as Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR). Variable-temperature FTIR spectra of P(AZO-T-MA) revealed thermal-induced dissociation and association behaviors during heating and cooling processes, indicating its responsiveness to temperature changes. Isomerization degrees were calculated based on the absorption changes observed in ultraviolet–visible (UV–vis) spectra under UV irradiation. P(AZO-T-MA) exhibited efficient isomerization behavior and excellent surface relief grating (SRG) formability, achieving a modulation depth of over 800 nm at an appropriate film thickness. This value is relatively high for supramolecular materials. P(AZO-T-MA) exhibited a somewhat higher glass-transition temperature (Tg) of 121.8 °C compared to P(AZO-N3-MA) (62.7 °C). This higher Tg contributed to the better storage durability of SRG, as observed over 28 days. The fabrication of two-dimensional (2D) SRGs was also explored, and it was found that the material's Tg played a crucial role in determining the success of the 2D SRG formation. These findings suggest that the polymers hold promise for applications in long-life optical storage devices and the creation of complex architectural patterns. Their unique combination of thermal responsiveness, high formability, and storage durability makes them valuable materials for various optical applications.
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