Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile.
Departamento de Química Física, Facultad de Química y Farmacia, Pontificia Universidad Católica de Chile, Macul, 7820436 Santiago, Chile; Instituto Universitario de Bio-Organica Antonio Gonzalez, Universidad de La Laguna, Avda. Astrofísico Francisco Sanchez 2, 38206 La Laguna, Tenerife, Spain; Departamento de Química Orgánica, Universidad de La Laguna, Avda. Astrofísico Francisco Sánchez S/N, 38206 La Laguna, Tenerife, Spain.
Int J Biol Macromol. 2023 Jul 1;242(Pt 3):124883. doi: 10.1016/j.ijbiomac.2023.124883. Epub 2023 May 17.
The light-induced processes performed by photofunctional polymer films are crucial aspects of developing integrated energy storage devices properly. Herein, we report the preparation, characterization, and study of the optical properties of a series of biobased cellulose acetate/azobenzene (CA/Az1) handleable films at different compositions. The photoswitching/back-switching behavior of the samples was investigated using varied LED irradiation sources. Additionally, poly(ethylene glycol) (PEG) was deposited onto cellulose acetate/azobenzene films to study the back-switching process's effect and nature in the fabricated films. Interestingly, the melting enthalpies of PEG before and after being irradiated with blue LED light were 2.5 mJ and 0.8 mJ, respectively. Conveniently, FTIR and UV-visible spectroscopy, thermogravimetry (TGA), contact angle, differential scanning calorimetry (DSC), polarized light microscopy (PLM), and atomic force microscopy (AFM) were used for the characterization of the sample films. Complementarily, theoretical electronic calculations provided a consistent approach to the energetic change in the dihedral angles and non-covalent interaction for the trans and cis isomer in the presence of cellulose acetate monomer. The results of this study revealed that CA/Az1 films are viable photoactive materials displaying handleability attributes with potential uses in harvesting, converting, and storing light energy.
光致功能聚合物薄膜所执行的光诱导过程是正确开发集成储能器件的关键方面。在此，我们报告了一系列基于生物的醋酸纤维素/偶氮苯（CA/Az1）可处理薄膜的制备、表征和光学性质研究，这些薄膜具有不同的组成。使用不同的 LED 辐射源研究了样品的光致开关/反向开关行为。此外，将聚乙二醇（PEG）沉积到醋酸纤维素/偶氮苯薄膜上，以研究在制备的薄膜中反向开关过程的影响和性质。有趣的是，在蓝 LED 光照射前后，PEG 的熔融焓分别为 2.5 mJ 和 0.8 mJ。方便的是，傅里叶变换红外光谱（FTIR）和紫外-可见光谱、热重分析（TGA）、接触角、差示扫描量热法（DSC）、偏光显微镜（PLM）和原子力显微镜（AFM）用于样品薄膜的表征。此外，理论电子计算为存在醋酸纤维素单体时顺反异构体的二面角和非共价相互作用的能量变化提供了一致的方法。这项研究的结果表明，CA/Az1 薄膜是可行的光活性材料，具有可处理的属性，可用于收集、转换和存储光能。
