Chemical constitution of polyfurfuryl alcohol investigated by FTIR and Resonant Raman spectroscopy
| Autor: | Letizia Scarabattoli, Andreas Reyer, Nicola Cefarin, Thomas Schnabel, Francesco D'Amico, Giovanni Birarda, Lisa Vaccari, Gianluca Tondi, Thomas Sepperer, Raphael J. F. Berger, Durval Bertoldo Menezes, Maurizio Musso |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Chemical structure
Infrared spectroscopy 02 engineering and technology Spectrum Analysis Raman 010402 general chemistry Vibration 01 natural sciences Analytical Chemistry Furfuryl alcohol chemistry.chemical_compound symbols.namesake Spectroscopy Fourier Transform Infrared Fourier transform infrared spectroscopy Spectroscopy Instrumentation chemistry.chemical_classification Chemistry Polymer 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Polymerization symbols Quantum Theory Physical chemistry 0210 nano-technology Raman spectroscopy |
| Popis: | The actual chemical structure of polyfurfuryl alcohol (PFA) is still uncertain in spite of several studies on the topic, variations during the polymerization processes being one reason that must be addressed. The use of a limited set of analytical techniques is often insufficient to provide an exhaustive chemical characterization. Moreover, it is still not possible to exactly determine presence and amount of each specific functional group in the polymeric structure. We employed both Fourier Transform Infrared Spectroscopy (FTIR) and Resonant Raman spectroscopy (RR), corroborated by quantum mechanically aided analysis of the experimental spectra, to infer about the chemical structure of two samples of PFAs, synthetized in different ways and appearing macroscopically different, the first one being a liquid and viscous commercial sample, the second one being a self-prepared solid and rigid sample produced following a thermosetting procedure. The vibrational spectroscopic analysis confirms the presence of differences in their chemical structures. The viscous form of PFA is mainly composed by short polymeric chains, and is characterized by the presence of isolated furfuryl alcohol and furfural residues similar to 5-hydroxymethylfurfural; the thermosetted PFA is formed by more cross-linked structures, characterized by several ketones and alkene double bonds, as well as a significant presence of Diels-Alder structures. In summary, the present study evidences how the use of both FTIR and RR spectroscopy, the latter carried out at several laser excitation wavelengths, indicates an accurate way to spectroscopically investigate complex polymers enabling to satisfactorily infer about their peculiar chemical structure. |
| Databáze: | OpenAIRE |
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