Self-Healing in Mobility-Restricted Conditions Maintaining Mechanical Robustness: Furan–Maleimide Diels–Alder Cycloadditions in Polymer Networks for Ambient Applications
| Autor: | Dorothee Ehrhardt, Bruno Van Mele, Kurt Van Durme, Jessica Mangialetto, Niko Van den Brande, Jolien Bertouille |
|---|---|
| Přispěvatelé: | Materials and Chemistry, Faculty of Engineering, Faculty of Sciences and Bioengineering Sciences, Chemistry, Physical Chemistry and Polymer Science, Vriendenkring VUB |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Isothermal microcalorimetry
Materials science kinetic simulations Polymers and Plastics reversible thermosets Methacrylate Article lcsh:QD241-441 chemistry.chemical_compound Differential scanning calorimetry self-repair of microcracks lcsh:Organic chemistry Maleimide chemistry.chemical_classification Rheometry dynamic covalent bonds self-healing in vitrified state encapsulant for photovoltaics Encapsulants for photovoltaics General Chemistry Dynamic mechanical analysis Polymer Dynamic covalent bonds chemistry Chemical engineering Glass transition Self-healing in vitrified state |
| Zdroj: | Polymers; Volume 12; Issue 11; Pages: 2543 Polymers Polymers, Vol 12, Iss 2543, p 2543 (2020) |
| Popis: | Two reversible polymer networks, based on Diels–Alder cycloadditions, are selected to discuss the opportunities of mobility-controlled self-healing in ambient conditions for which information is lacking in literature. The main methods for this study are (modulated temperature) differential scanning calorimetry, microcalorimetry, dynamic rheometry, dynamic mechanical analysis, and kinetic simulations. The reversible network 3M-3F630 is chosen to study the conceptual aspects of diffusion-controlled Diels–Alder reactions from 20 to 65 °C. Network formation by gelation is proven and above 30 °C gelled glasses are formed, while cure below 30 °C gives ungelled glasses. The slow progress of Diels–Alder reactions in mobility-restricted conditions is proven by the further increase of the system’s glass transition temperature by 24 °C beyond the cure temperature of 20 °C. These findings are employed in the reversible network 3M-F375PMA, which is UV-polymerized, starting from a Diels–Alder methacrylate pre-polymer. Self-healing of microcracks in diffusion-controlled conditions is demonstrated at 20 °C. De-gelation measurements show the structural integrity of both networks up to at least 150 °C. Moreover, mechanical robustness in 3M-F375PMA is maintained by the poly(methacrylate) chains to at least 120 °C. The self-healing capacity is simulated in an ambient temperature window between −40 and 85 °C, supporting its applicability as self-healing encapsulant in photovoltaics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|