Thermal and FTIR study of polyvinylpyrrolidone/lignin blends
| Autor: | C. A. Da Silva, F. C. Fogo, Marcela Fernandes Silva, Edgardo Alfonso Gómez Pineda, Anita A. W. Hechenleitner |
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| Rok vydání: | 2005 |
| Předmět: |
Materials science
Polyvinylpyrrolidone Condensed Matter Physics Solvent Crystallinity chemistry.chemical_compound chemistry Polymer chemistry medicine Lignin Thermal stability Polymer blend Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Thermal analysis Nuclear chemistry medicine.drug |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 79:367-370 |
| ISSN: | 1572-8943 1388-6150 |
| DOI: | 10.1007/s10973-005-0066-2 |
| Popis: | Lignin and poly(vinylalcohol) (PVA) solutions were separately prepared and then mixed in appropriate ratios, to yield the films after solvent (DMSO) evaporation. Two lignin samples were used: kraft lignin (KL) and acetone soluble fraction of kraft lignin (AKL). Different carbonyl and hydroxyl contents were detected by 1 HNMR and by FTIR for KL and AKL. PVA films containing up to 25p of lignin were prepared and irradiated with UV light for different time intervals. These films were analyzed using FTIR, TG and DSC. Due to the lignin incorporation in PVA films an increase in the thermal stability was observed. From DSC experiments, PVA/KL seems to provide a more homogeneous material compared to PVA/AKL, especially at 95/5 composition. PVA/KL films seem to have greater resistance to photochemical attack, as evaluated by crystallinity changes after irradiation of the film. |
| Databáze: | OpenAIRE |
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