PES-C增韧E51/DETDA环氧树脂及其炭纤维复合材料的研究

Cardo poly (ether sulfone) toughened E51/DETDA epoxy resin and its carbon fiber composites

  • 摘要: 一种能有效提高炭纤维复合材料层间韧性的增韧剂对于各种应用都至关重要。本文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。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: A toughener that can effectively improve the interlaminar toughness in carbon fiber composites is crucial for various applications. We investigated, the toughening effects of phenolphthalein-based cardo poly (ether sulfone) (PES-C) on E51/ DETDA epoxy and its carbon fiber composites (CFCs). Scanning electron microscopy showed that the phase structures of PES-C/epoxy blends change from island (of dispersed phase) structures to bi-continuous structures (of the matrix) as the PES-C content increased, which is associated with reaction-induced phase separation. After adding 15 phr PES-C, the glass transition temperature (Tg) of the blends increased by 51.5 °C, and 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. A PES-C film was used to improve the mode-II fracture toughness (GIIC) of CFCs. TheGIIC value of the 7 μm PES-C film toughened laminate was improved by 80.3% compared to that of the control laminate. The increase inGIIC was attributed to cohesive failure and plastic deformation in the interleaving region.

     

/

返回文章
返回