Evaluation of Dispersion Methods and Mechanical Behaviour of Glass Fibre Composites with Embedded Self-Healing Systems
| Autor: | Madalina Ioana Necolau, Lucia Raluca Maier, Alexandru Paraschiv, Adela Bara, Mihaela Raluca Condruz, Ionut Sebastian Vintila, Horia Alexandru Petrescu, Sorin Draghici |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polymers and Plastics polymer composites Glass fiber Organic chemistry FEM analysis 02 engineering and technology Bending Temperature cycling 010402 general chemistry 01 natural sciences Article thermal stability chemistry.chemical_compound QD241-441 dicyclopentadiene self-healing Thermal stability Composite material Drop (liquid) Izod impact strength test General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences chemistry Dicyclopentadiene 5-ethylidene-2-norbornene 0210 nano-technology Dispersion (chemistry) |
| Zdroj: | Polymers Polymers, Vol 13, Iss 1642, p 1642 (2021) Volume 13 Issue 10 |
| ISSN: | 2073-4360 |
| Popis: | The present paper is focused on evaluating the most suitable dispersion method in the epoxy matrix of two self-healing systems containing dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB) monomers encapsulated in a urea-formaldehyde (UF) shell, prior to integration, fabrication and impact testing of specimens. Both microstructural analysis and three-point bending tests were performed to evaluate and assess the optimum dispersion method. It was found that ultrasonication damages the microcapsules of both healing systems, thus magnetic stirring was used for the dispersion of both healing systems in the epoxy matrix. Using magnetic dispersion, 5%, 7%, 10%, 12% and 15% volumes of microcapsules were embedded in glass fibre composites. Some of the samples were subjected to thermal cycling between −20 °C and +100 °C for 8 h, to evaluate the behaviour of both healing systems after temperature variation. Impact test results showed that the mechanical behaviour decreases with increasing microcapsule volume, while for specimens subjected to thermal cycling, the impact strength increases with microcapsule volume up to 10%, after which a severe drop in impact strength follows. Retesting after 48 h shows a major drop in mechanical properties in specimens containing 15% MUF-ENB microcapsules, up to total penetration of the specimen. |
| Databáze: | OpenAIRE |
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