Isothermal Kinetics of Epoxyphosphazene Cure
| Autor: | Denis V. Onuchin, Viktoria V. Petrakova, Natalia V. Bornosuz, Irina Yu. Gorbunova, Igor S. Sirotin, Vyacheslav V. Kireev, Vyacheslav V. Shutov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics Model fitting General Chemistry Epoxy isoconversional kinetics Article lcsh:QD241-441 Differential scanning calorimetry lcsh:Organic chemistry epoxy resins kinetics of curing visual_art Polyamide visual_art.visual_art_medium Composite material model fitting epoxyphosphazenes Isothermal kinetics Curing (chemistry) |
| Zdroj: | Polymers, Vol 13, Iss 297, p 297 (2021) Polymers Volume 13 Issue 2 |
| ISSN: | 2073-4360 |
| Popis: | The influence of epoxycyclophosphazene modifier on the process of epoxy-amine curing was studied by differential scanning calorimetry (DSC). The study revealed that the curing process of epoxyphosphazene binders with 4&prime 4&prime diaminodiphenylsulfone (DDS) provides more complete curing of the formulations in comparison with ones applying low molecular-weight polyamide curing agent (L-20). The isothermal kinetics of curing was described by means of model fitting and the isoconversional approach (Friedman method). Accurate n-order approximation was obtained for all systems under study. In particular, the 2-order equation fits well with the main part of curing excluding high degrees of conversion. The process of curing could be distinguished into three zones. The transition from zone 2 to zone 3 correlates with gelation. According to the isoconversional analysis by Friedman method, the diffusion-controlled mechanism is found at final stage of curing. |
| Databáze: | OpenAIRE |
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