Toughened poly(lactic acid)(PLA)3D printing feedstock was prepared via melt-compounding using PLA as raw materials and impact modifier BPM520 as toughening agent.The effect of toughening on the mechanical properties,melt flow rate,complex viscosity and thermal properties of PLA was investigated.The five-factor and four-level design of orthogonal experiment was conducted to obtain the optimal 3D printing process parameters of modified PLA.The results indicated that toughened PLA showed improved toughness,the elongation at break increased from 11.8％to 33.8％,the impact strength increased from 29.1 J/m to 70.7 J/m with respect to pure PLA.The modified PLA also showed higher processability.The optimal 3D printing process parameters of toughened PLA obtained from orthogonal experimental results analysis were proposed as layer height 0.25 mm,infill density 100％,wall thickness 1.2 mm,print speed 60 mm/s,and infill pattern lines.The 3D-printed test samples from toughened PLA prepared at the optimal process parameters exhibited higher tensile properties and impact strength than the samples 3D-printed from reference PLA filament.
维普
万方数据