Abstract
The effect of Ex-situ method on the mechanical properties and toughness of the RTMable polyimide composites were studied. The results showed that the interlaminar shear strength of composites toughened by the Ex-situ technique was improved from 97.9 MPa to 110 MPa. when the thermoplastic PI content is 15wt%, However, the Tg and the interlaminar shear strength of composites at high temperature(288°C) decreased slightly. The Mode I fracture toughness(GIC)of composites toughened by the Ex-situ method was improved from 310 J/m2 to 459 J/m2. From SEM results, the main reason is that the PI-9731/G827 composite toughened by the Ex-situ method with the thermoplastic PI, the phase inversion structure can be obtained in the rich resin regions, the PI-9731 particles that were wrapped by thermoplastic PI will be orientated and deformed in the process of crack extension.
| Original language | English |
|---|---|
| Pages (from-to) | 72-77 |
| Number of pages | 6 |
| Journal | Hangkong Cailiao Xuebao/Journal of Aeronautical Materials |
| Volume | 28 |
| Issue number | 6 |
| Publication status | Published - Dec 2008 |
| Externally published | Yes |
Keywords
- Mechanical properties
- Polyimides composites
- RTM, Ex-situ toughening
ASJC Scopus subject areas
- Ceramics and Composites
- Aerospace Engineering
- Metals and Alloys
- Materials Chemistry