To develop new materials for extrusion additive manufacturing (AM) systems, a fundamental understanding of rheological properties is essential to correlate the effect of processing on material structure and its properties. In this work, the rheological properties of five different grades of neat and carbon fiber (CF)‐reinforced poly(ether ketone ketone) are reported. Rheological properties are essential to understand the effect of reinforcing fibers and AM process parameters such as time, temperature, environment, and shear rate on flow behavior during processing. Small‐amplitude oscillatory shear tests and steady shear tests indicated neat grades to exhibit less increase in viscosity over time when processed in air than the CF‐filled grades. The filled grades showed greater shear thinning and lower sensitivity to temperature. Overall, this rheological analysis provides a broad framework for determining appropriate processing conditions for extrusion deposition AM of such high‐temperature polymer systems.

中文翻译：

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纯净和碳纤维增强的聚醚醚酮的流变行为，用于挤出沉积增材制造

为了开发用于挤出增材制造（AM）系统的新材料，对流变特性的基本了解对于关联加工对材料结构及其特性的影响至关重要。在这项工作中，报告了五种不同等级的纯净和碳纤维（CF）增强的聚醚醚酮的流变特性。流变特性对于理解增强纤维和增材制造工艺参数（例如时间，温度，环境和剪切速率）在加工过程中对流动行为的影响至关重要。小振幅振荡剪切试验和稳态剪切试验表明，与在CF中填充的牌号相比，在空气中加工时，纯净的牌号在空气中随时间的变化表现出较小的粘度增加。填充等级显示更大的剪切稀化和更低的温度敏感性。总体，