A high-speed air flow field driven jetting method was proposed for efficient three dimensional(3D)printing of molten polylactic acid(PLA)microfibers.The principle of shear crushing of molten materials by high-speed airflow was analyzed,and the influence of key parameters,such as,supply air pressure,airflow velocity and printing height on the diameter distribution of microfibers and the porosity and cross-section size of the material structure in the printing process was investigated.In addition,the surface wettability of the PLA microfibers was tested.Compared to electrostatic spinning,this process improves processing efficiency by more than 10 times.Controlling different printing parameters can effectively control fiber diameters in the range of 6-18 μm and porosities in the range of 55％-96％.3D printing can produce microfiber structures with macroscopic path controllable and microscopic with high porosity.The surface wettability results indicate that the printed microfibers have hydrophobic and adhesive properties due to the combined effect of the material's molecular groups and high porosity,and the fabrication of a local hydrophobic and hydrophilic coexisting structure of the same material by hydrophilic treatment of the microscopic localization demonstrates the validity of the surface wettability regulation method.
关键词
气流场驱动/熔融聚乳酸/三维打印/微细纤维/表面浸润性
Key words
Air Flow Field Driven/Molten Polylactic Acid/Three Dimensional Printing/Microfiber/Surface Wettability
维普
万方数据