Yu Wangwang, Sun Liwei, Li Mengya, Li Meihui, Lei Wen, Wei Chaohui
School of Mechanical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China.
College of Science, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2023 Nov 2;15(21):4305. doi: 10.3390/polym15214305.
Poly(lactic acid) (PLA) and Poly(butylene succinate) (PBS) were chosen as raw materials and melt blended by a twin screw extruder and pelletized; then, the pellets were extruded into filaments; after that, various PBS/PLA blending samples were prepared by Fused Deposition Molding (FDM) 3D printing technology using the filaments obtained and the effect of the dosage of PBS on technological properties of 3D-printed specimens was investigated. For comparison, the PLA specimen was also prepared by FDM printing. The tensile strength, tensile modulus, thermal stability, and hydrophilicity became poorer with increasing the dosage of PBS, while the flexural strength, flexural modulus, impact strength, and crystallinity increased first and then decreased. The blend containing 10% PBS (10% PBS/PLA) had the greatest flexural strength of 60.12 MPa, tensile modulus of 2360.04 MPa, impact strength of 89.39 kJ/m, and crystallinity of 7.4%, which were increased by 54.65%, 61.04%, 14.78%, and 51.02% compared to those of printed PLA, respectively; this blend also absorbed the least water than any other specimen when immersed in water. Different from the transparent PLA filament, 10% PBS/PLA filament presented a milky white appearance. The printed 10% PBS/PLA specimen had a smooth surface, while the surface of the printed PLA was rough. All the results indicated that the printed 10% PBS/PLA specimen had good comprehensive properties, including improved mechanical properties, crystallization performance, and surface quality than PLA, as well as proper wettability and water absorption. The prominent conclusion achieved in this work was that 10% PBS/PLA should be an ideal candidate for biodegradable feedstock among all the PBS/PLA blends for FDM 3D printing.
选用聚乳酸（PLA）和聚丁二酸丁二醇酯（PBS）作为原料，通过双螺杆挤出机进行熔融共混并造粒；然后，将粒料挤出成丝状；之后，使用所得丝状材料通过熔融沉积成型（FDM）3D打印技术制备了各种PBS/PLA共混样品，并研究了PBS用量对3D打印试样工艺性能的影响。为作比较，还通过FDM打印制备了PLA试样。随着PBS用量的增加，拉伸强度、拉伸模量、热稳定性和亲水性变差，而弯曲强度、弯曲模量、冲击强度和结晶度则先增加后降低。含10%PBS的共混物（10%PBS/PLA）具有最大弯曲强度60.12MPa、拉伸模量2360.04MPa、冲击强度89.39kJ/m²和结晶度7.4%，与打印的PLA相比，分别提高了54.65%、61.04%、14.78%和51.02%；该共混物在水中浸泡时吸收的水分也比其他任何试样都少。与透明的PLA丝状材料不同，10%PBS/PLA丝状材料呈现乳白色外观。打印的10%PBS/PLA试样表面光滑，而打印的PLA表面粗糙。所有结果表明，打印的10%PBS/PLA试样具有良好的综合性能, 包括与PLA相比改善的机械性能、结晶性能和表面质量，以及适当的润湿性和吸水性。这项工作得出的突出结论是，在所有用于FDM 3D打印的PBS/PLA共混物中，10%PBS/PLA应该是可生物降解原料的理想选择。
