The aim of this work is to enhance the impact strength and tensile modulus of the PP/EPDM/TiO₂ nanocomposite fabricated by fused filament fabrication. Hence, the response surface methodology and desirability function procedure were applied to find the optimum values of TiO₂ content, nozzle temperature and printing speed. Then, the microstructural features of the printed samples were investigated by SEM, TGA and DSC analyses. The results indicated that the greatest impact strength of samples (73 J/m) was attained at a TiO₂ content of 4 wt%, while the tensile modulus of samples was maximized (1130 MPa) at a TiO₂ content of 2 wt% due to good distribution of the nanoparticles. The increase of the nozzle temperature from 200 to 225 ºC resulted in an improvement in the impact strength (16.2%) and tensile modulus (11.1%) because of suitable viscosity of the filament, whereas the impact strength (11.2%) and tensile modulus (6.7%) were reduced with the increase of nozzle temperature from 225 to 250 ºC because of the thermal degradation of filament. Moreover, as the printing speed increased from 20 to 40 mm/s, the tensile modulus initially enhanced by 2.4% and then decreased by 1.2%, but the impact strength continuously decreased by 6.5%. Finally, the simultaneous enhancement of the impact strength and tensile modulus has been attained at a TiO₂ content of 2.4 wt%, nozzle temperature of 226 ºC and printing speed of 28 mm/s.

这项工作的目的是提高通过熔丝制造制备的PP/EPDM/TiO _{2纳米复合材料的冲击强度和拉伸模量。}因此，应用响应面法和期望函数程序来找到TiO ₂含量、喷嘴温度和打印速度的最佳值。然后，通过 SEM、TGA 和 DSC 分析研究了打印样品的微观结构特征。_{结果表明，当 TiO 2}含量为 4 wt%时，样品的冲击强度达到最大（73 J/m） ，而当 TiO ₂含量为 2 wt%时，样品的拉伸模量达到最大（1130 MPa）。以保证纳米颗粒的良好分布。喷嘴温度从200℃增加到225℃，由于长丝粘度合适，冲击强度（16.2％）和拉伸模量（11.1％）提高，而冲击强度（11.2％）和拉伸模量（由于灯丝的热降解，随着喷嘴温度从 225 ℃升高到 250 ℃，该值降低了 6.7%。此外，随着打印速度从20毫米/秒增加到40毫米/秒，拉伸模量先增加2.4%，然后下降1.2%，但冲击强度持续下降6.5%。_{最终，在TiO 2}含量为2.4 wt%、喷嘴温度为226 ℃、打印速度为28 mm/s 时，实现了冲击强度和拉伸模量的同时提高。