FT NIR Raman studies of alginic acid-benzimidazole polymer composite.
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.
Institute of Molecular Physics, Polish Academy of Sciences, Poznań, Poland. polomska@ifmpan.poznan.pl
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Połomska
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Pogorzelec-Glaser
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Pietraszko
D000464:Alginates / Q000737:chemistry*; D001562:Benzimidazoles / Q000737:chemistry*; D004553:Electric Conductivity; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D019265:Spectroscopy, Near-Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature
D000464:Alginates; D001562:Benzimidazoles; D006603:Hexuronic Acids; D011108:Polymers; D020723:Glucuronic Acid; C031000:benzimidazole