Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Aug 15;79(4):797-800. doi: 10.1016/j.saa.2010.08.055. Epub 2010 Oct 18.
New bio-inspired polymer composites of alginic acid and benzimidazole were created and characterized by FT NIR Raman spectroscopy. The obtained films with 1:0.5, 1:1 and 1:1.5 molar ratio are homogeneous, with good mechanical properties. Raman spectra recorded at room temperature revealed that the obtained films are a new compound with a different molecular structure and physical properties compared with pure substrates: alginic acid and benzimidazole. Raman band related to vibration of COOH entity at 1740 cm(-1) of alginic acid disappears in the alginic acid:benzimidazole composites, in which new Raman band related to COO(-) was found. Additionally, characteristic lines observed in polymer composites which may be associated with vibrations of NH groups, can be attributed to the linking of proton to deprotonated N atom in benzimidazole group. Possibility of such proton exchange is a promising property which might facilitate the application of obtained composites to anhydrous proton conducting electrolytes in fuel cells.
采用傅里叶变换近红外拉曼光谱法制备并表征了新型仿生性的海藻酸钠-苯并咪唑聚合物复合材料。当摩尔比为 1:0.5、1:1 和 1:1.5 时，所得到的薄膜均一，力学性能良好。在室温下记录的 Raman 光谱表明，与纯基质海藻酸钠和苯并咪唑相比，所得到的薄膜是一种具有不同分子结构和物理性质的新型化合物。海藻酸钠中与 COOH 基团振动相关的 Raman 带在海藻酸钠：苯并咪唑复合材料中消失，而在其中发现了与 COO(-)相关的新 Raman 带。此外，在聚合物复合材料中观察到的特征谱线可能与 NH 基团的振动有关，可归因于质子与苯并咪唑基团中去质子化的 N 原子的连接。这种质子交换的可能性是一种很有前途的特性，可能会促进所得到的复合材料在燃料电池中无水质子传导电解质中的应用。
