Nofal Muaffaq M, Aziz Shujahadeen B, Hadi Jihad M, Karim Wrya O, Dannoun Elham M A, Hussein Ahang M, Hussen Sarkawt A
Department of Mathematics and General Sciences, Prince Sultan University, P.O. Box 66833, Riyadh 11586, Saudi Arabia.
Hameed Majid Advanced Polymeric Materials Research Laboratory, Physics Department, College of Science, University of Sulaimani, Qlyasan Street, Sulaimani 46001, Kurdistan Regional Government, Iraq.
Polymers (Basel). 2021 May 19;13(10):1648. doi: 10.3390/polym13101648.
In this work, a green approach was implemented to prepare polymer composites using polyvinyl alcohol polymer and the extract of black tea leaves (polyphenols) in a complex form with Co ions. A range of techniques was used to characterize the Co complex and polymer composite, such as Ultraviolet-visible (UV-Visible) spectroscopy, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The optical parameters of absorption edge, refractive index (), dielectric properties including real and imaginary parts (, and ) were also investigated. The FRIR and XRD spectra were used to examine the compatibility between the PVA polymer and Co-polyphenol complex. The extent of interaction was evidenced from the shifts and change in the intensity of the peaks. The relatively wide amorphous phase in PVA polymer increased upon insertion of the Co-polyphenol complex. The amorphous character of the Co complex was emphasized with the appearance of a hump in the XRD pattern. From UV-Visible spectroscopy, the optical properties, such as absorption edge, refractive index (), (), (), and bandgap energy () of parent PVA and composite films were specified. The of PVA was lowered from 5.8 to 1.82 eV upon addition of 45 mL of Co-polyphenol complex. The was calculated from the optical dielectric function. Ultimately, various types of electronic transitions within the polymer composites were specified using Tauc's method. The direct bandgap (DBG) treatment of polymer composites with a developed amorphous phase is fundamental for commercialization in optoelectronic devices.
在这项工作中，采用了一种绿色方法来制备聚合物复合材料，该复合材料由聚乙烯醇聚合物与以与钴离子形成络合物形式存在的红茶树叶提取物（多酚）组成。使用了一系列技术来表征钴络合物和聚合物复合材料，如紫外可见光谱、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）。还研究了吸收边、折射率（）、包括实部和虚部（、和）的介电性能等光学参数。利用FTIR和XRD光谱来研究聚乙烯醇聚合物与钴多酚络合物之间的相容性。峰位的移动和强度的变化证明了相互作用的程度。钴多酚络合物插入后，聚乙烯醇聚合物中相对较宽的非晶相增加。XRD图谱中驼峰的出现突出了钴络合物的非晶特性。通过紫外可见光谱，确定了母体聚乙烯醇和复合薄膜的光学性能，如吸收边、折射率（）、（）、（）和带隙能量（）。加入45 mL钴多酚络合物后，聚乙烯醇的从5.8 eV降至1.82 eV。由光学介电函数计算得出。最终，使用陶克方法确定了聚合物复合材料内的各种电子跃迁类型。具有发达非晶相的聚合物复合材料的直接带隙（DBG）处理对于光电器件的商业化至关重要。
