Structure correlation of silylated dicarboxylic acid monomer and its respective oligomeric polyamide-imide using experimental and theoretical vibrational spectra |
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Authors: | Carmen M. González-Henríquez Claudio A. Terraza Mauricio A. Sarabia Alejandra M. Vera Álvaro E. Aliaga |
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Affiliation: | 1. Departamento de Química, Facultad de Ciencias Naturales, Matemáticas y del Medio Ambiente, Universidad Tecnológica Metropolitana, Santiago, Chile;2. Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile;3. Departamento de Ingeniería Estructural y Geotecnia, Pontificia Universidad Católica de Chile, Santiago, Chile;4. Departamento de Química, Universidad de Chile, Facultad de Ciencias, Santiago, Chile |
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Abstract: | Correlation between theoretical and experimental (infrared and Raman spectroscopies) vibrational spectra of two compounds, both with a silyl group present in their main chain and with an optically active structure (L-valine) as side group, was performed. These compounds are based in a chiral dicarboxylic acid monomer and its respective polyamide-imide, oligomer that was previously synthesized by a direct polycondensation. Spectra were recorded in the region comprised between 500 and 4000?cm?1 for infrared and Raman analysis. The Raman spectra were obtained through a 1064?nm laser as excitation source.Theoretical models were carried out in order to find the optimal molecular geometry of the analyzed systems, with a complete assignment of their vibrational spectra. The Raman experimental data obtained with a Nd:YAG laser for this kind of silylated organic compounds, and the comparison between these results with the theoretical data is a useful advance in the polymer synthesis field, which can be used as reference for subsequent studies. |
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Keywords: | Infrared and Raman spectroscopy modeling and simulation organo-metallic compounds polymer composites |
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