High-temperature capable (T_g: 280–290 °C), broadband radar transparent [ε′: 3.3–3.9; ε″: 0.02–0.17; tan δ: 0.01–0.04 and transmission loss: −0.18 to −1.26 dBl in C, X, and Ku bands (5.4–18 GHz)], composites were developed using polyetherimide (PEI)-toughened bisphenol E cyanate ester resin and E glass fabrics through an out-of-autoclave process called resin film infusion at a range of PEI weight fractions via a solvent-free method. Their pronounced increase in impact resistance in terms of mode I interlaminar fracture toughness (G_Ic; 50–100%), postimpact residual compressive strength (>85%), and enhanced structural properties such as tensile strength, compressive strength, in-plane shear strength, and interlaminar shear strength compared with control laminates, which later re-corroborated with a structure–property relationship using surface morphology proving that PEI-modified cyanate esters can find extensive applications in impact-resistant composite radomes for high-speed aircrafts.

中文翻译：

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使用聚醚酰亚胺增韧的氰酸酯树脂，通过树脂薄膜灌注，实现雷达透明，耐冲击和高温的雷达天线罩复合材料

耐高温（T _g：280–290°C），宽带雷达透明[ε'：3.3–3.9；ε”：0.02–0.17；tanδ：0.01–0.04，传输损耗：在C，X和Ku频段（5.4–18 GHz）中为−0.18至-1.26 dB，]，使用聚醚酰亚胺（PEI）增韧双酚E氰酸酯树脂和E玻璃制成复合材料通过无溶剂的高压灭菌工艺（称为树脂膜灌输），通过无溶剂方法在一定的PEI重量分数范围内制备织物。根据I型层间断裂韧性（G _Ic; 50–100％），冲击后的残余抗压强度（> 85％）以及增强的结构特性，例如与对照层压板相比，其抗拉强度，抗压强度，面内剪切强度和层间剪切强度，后来又得到了证实。使用表面形态的结构与属性的关系证明，PEI改性的氰酸酯可以在高速飞机的耐冲击复合天线罩中找到广泛的应用。