Evaluation of Dispersion Methods and Mechanical Behaviour of Glass Fibre Composites with Embedded Self-Healing Systems

Polymers

Madalina Necolau¹  Sorin Draghici²  HoriaAlexandru Petrescu²  Adela Bara³  MihaelaRaluca Condruz⁴  LuciaRaluca Maier⁴  Alexandru Paraschiv⁴  IonutSebastian Vintila⁴ 

[1] Advanced Polymer Materials Group, University Politehnica of Bucharest, 011061 Bucharest, Romania;Laboratory for Advanced Testing and Mechanical Characterization of Materials, Department of Strength of Materials, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania;National Institute for Research and Development in Electrical Engineering ICPE-CA Bucharest, 030138 Bucharest, Romania;National Research and Development Institute for Gas Turbines COMOTI, 061126 Bucharest, Romania;

关键词: polymer composites;    self-healing;    thermal stability;    FEM analysis;    dicyclopentadiene;    5-ethylidene-2-norbornene;   

DOI  :  10.3390/polym13101642

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown