Zhang Xiaojie, Xiao Jianhua, Kim Jinkuk, Cao Lan
School of Materials Science Engineering, Nanchang Hangkong University, Nanchang 330000, China.
School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
Polymers (Basel). 2022 Nov 28;14(23):5182. doi: 10.3390/polym14235182.
The limited number of materials and mechanical weakness of fused deposition modeling (FDM) parts are deficiencies of FDM technology. The preparation of polymer composites parts with suitable filler is a promising method to improve the properties of the 3D printed parts. However, the agglomerate of filler makes its difficult disperse in the matrix. In this work, graphene nanoplatelets (GnPs) were surface modified with chemical, low-temperature plasma and in situ methods, in order to apply them as fillers for thermoplastic polyurethane (TPU). Following its modification, the surface chemical composition of GnPs was analyzed. Three wt% of surface-modified GnPs were incorporated into TPU to produce FDM filaments using a melting compounding process. Their effects on rheology properties and electrical conductivity on TPU/GnPs composites, as well as the dimensional accuracy and mechanical properties of FDM parts, are compared. The images of sample facture surfaces were examined by scanning electron microscope (SEM) to determine the dispersion of GnPs. Results indicate that chemical treatment of GnPs with zwitterionic surfactant is a good candidate to significantly enhance TPU filaments, when considering the FDM parts demonstrated the highest mechanical properties and lowest dimensional accuracy.
熔融沉积建模（FDM）零件的材料数量有限以及机械性能较弱是FDM技术的不足之处。制备含有合适填料的聚合物复合材料零件是改善3D打印零件性能的一种很有前景的方法。然而，填料的团聚使其难以在基体中分散。在这项工作中，采用化学、低温等离子体和原位方法对石墨烯纳米片（GnPs）进行表面改性，以便将它们用作热塑性聚氨酯（TPU）的填料。改性后，对GnPs的表面化学成分进行了分析。使用熔融共混工艺将3 wt%的表面改性GnPs加入到TPU中以制备FDM长丝。比较了它们对TPU/GnPs复合材料的流变性能和电导率的影响，以及对FDM零件的尺寸精度和机械性能的影响。通过扫描电子显微镜（SEM）检查样品断裂表面的图像，以确定GnPs的分散情况。结果表明，考虑到FDM零件表现出最高的机械性能和最低的尺寸精度，用两性离子表面活性剂对GnPs进行化学处理是显著增强TPU长丝的一个很好的选择。
