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首页> 外文期刊>Journal of Applied Polymer Science >Role of CoBr2 on the Structural, Optical and Magnetic Properties of Polyvinyl Alcohol Films
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Role of CoBr2 on the Structural, Optical and Magnetic Properties of Polyvinyl Alcohol Films

机译：CoBr2对聚乙烯醇薄膜结构，光学和磁性的作用

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摘要

Polyvinyl alcohol (PVA) films filled with different concentrations of CoBr2 were prepared using the casting method. These films were characterized by FTIR, UV-visible, XRD, and ESR techniques. FTIR spectra were used to clarify the structural variations due to the filling level from CoBr2. The observed bands at 3484, 1733, and 1640 cm(-1) were assigned to O-H, C=O, and C=C stretching vibrations, respectively. UV-visible spectra shows the absorption band at 280 nm which is assigned to pi -> pi* transition. This indicates the presence of unsaturated bonds in tail to head of PVA. Optical energy gap decreased with increasing the concentration of CoBr2. X-ray diffraction scans show some decrease in the degree of crystallinity in the filled films which reveals an increase in amorphous phase of PVA due to the interaction between Co+2 and polymeric matrix causing a molecular rearrangement within the amorphous phase of PVA. The observed complex ESR spectrum due to hyperfine interactions confirms the role of free radicals. Spectroscopic and magnetic properties of PVA/CoBr2 composite films were investigated and compared with those of PVA alone. The results show that the change of the structure due to the interaction of filler with the polymer.
机译：使用流延方法制备了填充有不同浓度的CoBr2的聚乙烯醇（PVA）膜。这些薄膜通过FTIR，UV-可见，XRD和ESR技术进行了表征。 FTIR光谱用于阐明由于CoBr2的填充水平引起的结构变化。在3484、1733和1640 cm（-1）处观察到的频带分别分配给O-H，C = O和C = C拉伸振动。紫外可见光谱显示在280 nm处的吸收带，该吸收带分配给pi-> pi *跃迁。这表明在PVA的尾部至头部存在不饱和键。光学能隙随着CoBr2浓度的增加而减小。 X射线衍射扫描显示，填充膜的结晶度有所降低，这表明由于Co + 2与聚合物基质之间的相互作用导致PVA非晶相内的分子重排，导致PVA非晶相的增加。由于超精细相互作用而观察到的复杂ESR光谱证实了自由基的作用。研究了PVA / CoBr2复合薄膜的光谱和磁性，并将其与单独的PVA进行了比较。结果表明，结构的变化归因于填料与聚合物的相互作用。

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