Effects of UV irradiation and condensation on poly(ether-ether-ketone)/carbon fiber composites from nano- to macro-scale
| Autor: | Yi-Fan Niu, Jia-Wei Yao, Ying Yang, Tian-Yi Li |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry Condensation chemistry.chemical_element 02 engineering and technology Nanoindentation 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease_cause 01 natural sciences Durability 0104 chemical sciences Chemical engineering chemistry Nano Materials Chemistry Peek medicine Irradiation Composite material 0210 nano-technology Carbon Ultraviolet |
| Zdroj: | High Performance Polymers. 30:230-238 |
| ISSN: | 1361-6412 0954-0083 |
| DOI: | 10.1177/0954008316689600 |
| Popis: | Durability and damage mechanism of carbon fiber–reinforced poly(ether-ether-ketone) composites (T300/PEEK) have been investigated under ultraviolet (UV) and water condensation conditions for 1560 h. The tensile modulus decreased by 5.4% after 1560 h of exposure, while no significant changes were found in tensile strength. The microhardness and elastic modulus of the resin measured by atomic force microscope–based nanoindentation were found to be dramatically increased after 240 h treatment and then decreased after longer treatment. The thermal decomposition temperature decreased from 549° to 522° after 840 h of exposure due to the formation of side chains and low molecular products induced by UV. The damage of resin was attributed to chain scission and recombined cross-linking by UV irradiation and hydrolytic deterioration by hydrothermal conditioning, where the decomposition led to the formation of carbonyl groups and hydroxyl groups, as well as the reduction of ether groups determined by Fourier transform infrared spectroscope. Scanning electron microscopy analysis on tensile fractures near the exposed surface indicated fiber/matrix debonding. The resin on the surface degraded rapidly, and its roughness increased continuously from 30.8 ± 4.1 nm to 88.8 ± 6.8 nm after 840 h of degradation, with the formation of microholes and microcracks. A degradation mechanism was proposed, and the accelerated weather aging affected only the surface region of T300/PEEK. |
| Databáze: | OpenAIRE |
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