【摘要】 为提高微纳纤维素(MNC)与聚乳酸(PLA)复合材料的性能,将分散于二氯甲烷的MNC与溶解于二氯甲烷的PLA通过溶液共混法进行复合,成功制备了适用于FDM型3D打印机的MNC/PLA复合3D打印线材。采用硅烷偶联剂KH550对MNC进行改性,考察了KH550用量对MNC的晶型结构及对MNC/PLA复合材料断面形态和机械性能的影响,进一步研究了KH550改性MNC对MNC/PLA复合材料3D打印性能的影响。结果表明,溶液共混法制备的MNC/PLA复合3D打印线材可在保持复合材料机械性能的基础上将高含量的MNC与PLA均匀复合;1%用量(相对于MNC绝干质量)的KH550可改善复合材料的界面相容性且复合材料的机械性能最佳;制备的MNC/PLA复合3D打印线材经FDM型3D打印机可成功打印出3D打印产品。更多还原

【Abstract】 In this study, the micro-nanocellulose(MNC) dispersed in dichloromethane was mixed with polylactic acid(PLA) dissolved in dichloromethane by solution mixing method. The advantages of the composite materials prepared by solution mixing method compared with the melt blending method were analyzed. Further, MNC was modified with silane coupling agent(KH550) to improve the interface compatibility of the composite. The effects of the KH550 amount on the crystal structure of cellulose and the morphology as well as mechanical properties of the composites were investigated. The modified composite material was extruded by twin screw to prepare a wire suitable for FDM type 3 D printing. The results showed high content MNC could be mixed with PLA evenly without reducing the mechanical performance of the compo-site when MNC/PLA composite 3 D printing wire was prepared by solution mixing method. 1%of KH550(on over dried MNC) could effectively improve the interface compatibility of the composite.更多还原