The difficult forming process and construction caused by high viscosity has been the main problem restricting the application of high-performance thermoplastic/epoxy blends. In this contribution, low viscous polyetherketone (PEK)/diglycidyl ether of bisphenol A epoxy resin (DGEBA) blends were prepared by mixing the ultrafine PEK powder and DGEBA monomer at ambient temperature. Rheological behaviour shows that complex viscosity of the undissolved blends containing 20 wt% PEK powder is two orders of magnitude lower than that of the dissolved one. Interestingly, diffusion and phase separation of PEK powder in the undissolved PEK/DGEBA/2-methylimidazole/dicyandiamide (M-DICY) blends are affected by the curing processes. Phase-inverted morphology was observed after curing at 120°C/1h + 160°C/0.5 h for the undissolved 20 wt% PEK/DGEBA/M-DICY blends which also exhibited outstanding tensile strength and lap shear strength both at 298 and 77 K. We believe this work should provide a new insight into the preparation of advanced thermoplastic/epoxy blends.

中文翻译：

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具有低粘度和高机械性能的聚醚酮粉末/环氧树脂混合物

高粘度导致的成型工艺和施工困难一直是限制高性能热塑性/环氧树脂共混物应用的主要问题。在这一贡献中，通过在环境温度下混合超细 PEK 粉末和 DGEBA 单体，制备了低粘度聚醚酮 (PEK)/双酚 A 环氧树脂 (DGEBA) 共混物。流变行为表明，含有 20 wt% PEK 粉末的未溶解混合物的复数粘度比溶解的混合物低两个数量级。有趣的是，未溶解的 PEK/DGEBA/2-甲基咪唑/双氰胺 (M-DICY) 混合物中 PEK 粉末的扩散和相分离受固化过程的影响。在 120°C/1h + 160°C/0 下固化后观察到反相形态。