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摘要: 寻找一种用量低且能够有效提高炭纤维复合材料层间韧性的增韧剂是有意义的。在本文中，研究了酚酞聚芳醚砜（PES-C）对E51/DETDA环氧树脂及其炭纤维复合材料的增韧效果。SEM结果显示，PES-C/环氧树脂混合物形成了海岛相和双连续相结构，这与反应诱导相分离有关。加入15 phr PES-C后，混合物的Tg增加了51.5 °C。同时，混合物的弯曲强度、冲击强度和断裂韧性分别提高了41.1%、186.2%和42.7%。这些提升可归因于PES-C/环氧树脂系统的相结构。此外，PES-C薄膜被用作夹层以改善炭纤维复合材料的二型断裂韧性（GIIC）。7 μm PES-C薄膜增韧层压板的GIIC值比对照层压板提高了80.3%。GIIC的显著增加可归因于插层区域的内聚破坏和塑性变形。Abstract: It is meaningful to find a toughener with a low dosage and effective improvement of interlaminar toughness in carbon fiber composites. In this paper, the toughening effect of phenolphthalein-based poly (ether sulfone) (PES-C) on E51/ DETDA epoxy and its carbon fiber composites (CFCs) was investigated. The SEM results showed that PES-C/epoxy blends formed sea-island phase and bicontinuous phase structure, which were associated with reaction-induced phase separation. After adding 15 phr PES-C, the glass transition temperature (Tg) of blends was increased by 51.5 °C. Meanwhile, the flexural strength, impact strength and fracture toughness of the blends were improved by 41.1%, 186.2% and 42.7%, respectively. These improvements could be attributed to the phase separation structure of the PES-C/epoxy system. Moreover, PES-C film was used to improve the mode-II fracture toughness (GIIC) of CFCs. GIIC value of the 7 μm PES-C film toughened laminate was improved by 80.3% than that of control laminate. The increase in GIIC could be attributed to cohesive failure and plastic deformation in the interleaving region.
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Key words:
- epoxy resin /
- CFRP /
- PES-C /
- toughness
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Figure 2. (a)schematic illustrations of ENF test, (b) schematic diagram of the calculation method of compliance coefficient m
Figure 3. (a) 1H NMR spectrum of PES-C, (b) FTIR spectrum of PES-C, E51 and PES-C/epoxy cured blends containing different PES-C content
Figure 4. SEM images of the fractured surfaces of the PES-C/EP blends etched with DMF: (a) 0 phr, (b) 3 phr, (c) 5 phr, (d)10 phr and (e) 15 phr
Figure 5. Curves of (a) storage modulus, (b) tan δ with temperatures of PES-C/EP blends containing different PES-C loading
Figure 7. (a) tensile properties, (b) flexural properties, (c) fracture toughness, and (d) impact strength of the PES-C/EP blends
Figure 8. (a) SEM image of the fractured surface of the PES-C; SEM images of the fractured surfaces of the PES-C/EP blends: (b) 0 phr, (c) 3 phr, (d) 5 phr, (e)10 phr and (f) 15 phr
Figure 10. (a) Load-displacement curve diagram for ENF test, (b) mode-II interlaminar fracture toughness for laminated composites
Figure 11. The mode-Ⅱ fracture surface of laminate: (a) the control laminate, (b) the laminate with 4 μm PES-C film, (c) the laminate with 7 μm PES-C film, (d) the laminate with 10 μm PES-C film
Table 1. IDT, Td10, Td50 and Tf of PES-C/EP blends
PES-C content IDT (°C) Td10 (°C) Td50 (°C) Tf (°C) 0 phr 359.5 356.1 387.7 411.4 3 phr 359.1 355.8 388.7 412.3 5 phr 360.5 359.3 390.2 413.8 10 phr 359.3 360.1 391.4 414.2 15 phr 361.1 361.1 391.7 414.1 
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