Microstructural analysis of glass and carbon fiber-reinforced epoxy composites using positron annihilation lifetime spectroscopy: effects of machining and temperature
Artykuł w czasopiśmie
MNiSW
140
Lista 2024
| Status: | |
| Autorzy: | Ciecieląg Krzysztof, Wiertel Marek, Zaleski Radosław |
| Dyscypliny: | |
| Aby zobaczyć szczegóły należy się zalogować. | |
| Rok wydania: | 2026 |
| Wersja dokumentu: | Drukowana | Elektroniczna |
| Język: | angielski |
| Wolumen/Tom: | 206 |
| Numer artykułu: | 109810 |
| Impact Factor: | 8,9 |
| Efekt badań statutowych | NIE |
| Materiał konferencyjny: | NIE |
| Publikacja OA: | NIE |
| Abstrakty: | angielski |
| An in-depth analysis of the microstructural and thermal characteristics of fiber-reinforced polymer composites is conducted using Positron Annihilation Lifetime Spectroscopy (PALS). Two types of composites were examined: glass fiber-reinforced polymer (GFRP) and carbon fiber-reinforced polymer (CFRP), both made with epoxy resin. Samples were analyzed in two conditions: rough (as-fabricated via autoclave) and milled (after surface machining). PALS measurements revealed differences in positron lifetime components between GFRP and CFRP, indicating distinct positron trapping behaviors associated with the fiber type and polymer matrix. The formation of ortho-positronium (o-Ps) enabled the detection of free volumes, which appeared in two sizes – larger voids within the polymer and smaller ones at the fiber-epoxy interface. Machining was found to have a minimal effect on the internal structure, with only slight changes observed in GFRP. Temperature-dependent studies showed that the epoxy resin in GFRP transitioned from a glassy to a rubbery state near 40 °C, while in CFRP this transition occurred at a much lower temperature (around –10 °C). These results indicate that the fiber type has a significant impact on the thermal behavior of the polymer matrix. Furthermore, milling in the glassy phase likely results in greater structural changes than in the plastic phase. |
