FTIR 研究增塑的聚乙烯醇-壳聚糖共混物掺杂 NH4NO3 聚合物电解质膜。

FTIR studies of plasticized poly(vinyl alcohol)-chitosan blend doped with NH4NO3 polymer electrolyte membrane.

机构信息

Centre for Ionics, Physics Department, University of Malaya, Kuala Lumpur, Malaysia.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2011 Mar;78(3):1068-74. doi: 10.1016/j.saa.2010.12.051. Epub 2010 Dec 21.

DOI:10.1016/j.saa.2010.12.051

Abstract

Fourier transform infrared (FTIR) spectroscopy studies of poly(vinyl alcohol) (PVA), and chitosan polymer blend doped with ammonium nitrate (NH(4)NO(3)) salt and plasticized with ethylene carbonate (EC) have been performed with emphasis on the shift of the carboxamide, amine and hydroxyl bands. 1% acetic acid solution was used as the solvent. It is observed from the chitosan film spectrum that evidence of polymer-solvent interaction can be observed from the shifting of the carboxamide band at 1660 cm(-1) and the amine band at 1591 cm(-1) to 1650 and 1557 cm(-1) respectively and the shift of the hydroxyl band from 3377 to 3354 cm(-1). The hydroxyl band in the spectrum of PVA powder is observed at 3354 cm(-1) and is observed at 3343 cm(-1) in the spectrum of the PVA film. On addition of NH(4)NO(3) up to 30 wt.%, the carboxamide, amine and hydroxyl bands shifted from 1650, 1557 and 3354 cm(-1) to 1642, 1541 and 3348 cm(-1) indicating that the chitosan has complexed with the salt. In the PVA-NH(4)NO(3) spectrum, the hydroxyl band has shifted from 3343 to 3272 cm(-1) on addition of salt from 10 to 30 wt.%. EC acts as a plasticizing agent since there is no shift in the bands as observed in the spectrum of PVA-chitosan-EC films. The mechanism of ion migration is proposed for the plasticized and unplasticized PVA-chitosan-NH(4)NO(3) systems. In the spectrum of PVA-chitosan-NH(4)NO(3)-EC complex, the doublet CO stretching in EC is observed in the vicinity 1800 and 1700. This indicates that there is some interaction between the salt and EC.

摘要

傅里叶变换红外（FTIR）光谱研究了聚乙烯醇（PVA）和壳聚糖聚合物共混物，共混物中掺杂了硝酸铵（NH₄NO₃）盐，并使用碳酸亚乙酯（EC）进行了增塑。重点研究了酰胺、胺和羟基带的位移。使用 1%的乙酸溶液作为溶剂。从壳聚糖膜光谱中可以观察到，聚合物-溶剂相互作用的证据可以从酰胺带在 1660cm^-1和胺带在 1591cm^-1处的位移观察到，分别位移至 1650 和 1557cm^-1，以及羟基带从 3377 至 3354cm^-1。PVA 粉末光谱中的羟基带观察到在 3354cm^-1，PVA 膜光谱中的羟基带观察到在 3343cm^-1。当添加 NH₄NO₃至 30wt%时，酰胺、胺和羟基带从 1650、1557 和 3354cm^-1位移至 1642、1541 和 3348cm^-1，表明壳聚糖与盐发生了络合。在 PVA-NH₄NO₃光谱中，当盐从 10wt%添加至 30wt%时，羟基带从 3343 位移至 3272cm^-1。EC 作为增塑剂，因为在 PVA-壳聚糖-EC 膜光谱中没有观察到带的位移。提出了增塑和未增塑的 PVA-壳聚糖-NH₄NO₃系统中离子迁移的机制。在 PVA-壳聚糖-NH₄NO₃-EC 复合物的光谱中，观察到 EC 中的 CO 伸缩振动的双峰在 1800 和 1700 附近。这表明盐和 EC 之间存在一些相互作用。