Approaches on the non-isothermal curing kinetics of epoxy/PCL blends
| Autor: | Ingridy Dayane dos Santos Silva, Nichollas Guimarães Jaques, Janetty Jany Pereira Barros, Renate Maria Ramos Wellen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Kinetics Thermodynamics Kissinger 02 engineering and technology Activation energy 01 natural sciences Isothermal process Biomaterials Collision frequency 0103 physical sciences Ozawa Molecule Curing (chemistry) lcsh:Mining engineering. Metallurgy 010302 applied physics Málek Metals and Alloys Epoxy 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Friedman PCL visual_art DGEBA Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology |
| Zdroj: | Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 13539-13554 (2020) |
| ISSN: | 2238-7854 |
| Popis: | The non-isothermal curing kinetics of DGEBA/PCL/MTHPA/DEH 35 blends at 10, 20 and 30 phr of PCL were investigated applying Ozawa, Kissinger, Friedman autocatalytic, Friedman isoconversional and Malek models. From verified discrepancies between theoretical and experimental fits measured based on the models parameters such as activation energy ( E a ) and molecular collisions frequency (ln A), Ozawa and Kissinger presented higher deviation most likely due to the considered invariable energy along with the curing, while in Friedman and Malek's perspectives it is changeable, hence providing better data adjustments. PCL led to lower collision frequency among molecules, suggesting lower density microstructure related to epoxy, which corroborates to the system composed by physical (hydrogen bonds) and chemical (covalent bonds) crosslinking, altogether might provide swollen coils and occasionally, an interconnected structure that percolates the system resulting in (macro) gelation instead reticulation affording the workable character on epoxy/PCL blends. |
| Databáze: | OpenAIRE |
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