Thermal mending in novel epoxy/cyclic olefin copolymer blends
In this paper, the thermal mending potential of a cyclic olefin copolymer (COC) in a thermosetting matrix was evaluated for the first time. Epoxy/COC blends were prepared by mechanically mixing a COC powder (particle size lower than 300 μm) at different concentrations (10, 20, 30 and 40 wt%) in an e...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Budapest University of Technology and Economics
2020-04-01
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| Series: | eXPRESS Polymer Letters |
| Subjects: | |
| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0010356&mi=cd |
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| Summary: | In this paper, the thermal mending potential of a cyclic olefin copolymer (COC) in a thermosetting matrix was evaluated for the first time. Epoxy/COC blends were prepared by mechanically mixing a COC powder (particle size lower than 300 μm) at different concentrations (10, 20, 30 and 40 wt%) in an epoxy resin in the uncured (liquid) state. The presence of a homogenous dispersion of COC particles within the epoxy matrix after curing was confirmed by optical microscopy analysis on polished specimens. Thermogravimetric tests evidenced a positive contribution of the thermoplastic COC phase on the thermal degradation resistance of the blends. The fracture toughness of the blends (both under quasi-static and Charpy impact conditions) increased with the addition of COC. Healing tests were performed on broken samples after healing under a compressive stress of 15 MPa at 190 °C for 1 hour. A significant increase of the healing efficiency with the COC content was detected, and healing efficiency values very near to 100% were obtained for a COC content of 40 wt%. |
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| ISSN: | 1788-618X |