Fabrication of flexible wood flour/thermoplastic polyurethane elastomer composites using fused deposition molding
Fabrication of flexible wood flour/thermoplastic polyurethane elastomer composites using fused deposition molding
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DOI：
10.1016/j.indcrop.2018.05.059
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发表时间：
2018-10-15
影响因子：
5.9
通讯作者：
Song, Yongming
中科院分区：
文献类型：
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作者：
Bi, Hongjie;Ren, Zechun;Song, Yongming
采用三维打印技术，以热塑性聚氨酯（TPU）/木粉复合长丝为原料，制备了不同木粉含量和不同改性剂的木粉/TPU复合材料。这些纤维是通过TPU和WF的熔融共混和熔融挤出制备的。通过力学试验机、扫描电镜（SEM）、傅立叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和流变性能测试仪等测试手段，对3D打印产品的力学性能、微观形貌和化学结构进行了研究。结果表明，随着WF含量的增加，撕裂伸长率逐渐减小，拉伸强度先减小后增大。SEM和FTIR结果表明，EPDM-g-MAH改性后TPU与WF之间具有良好的相容性。XPS结果表明，二苯基甲基丙烷二异氰酸酯（MDI）和EPDM-g-MAH的改性对WF/TPU的界面结合性能有积极的影响。对TPU/WF复合材料流变性能的研究表明，EPDM-g-MAH改性后，复合材料的储能模量、损耗模量和复数粘度均显著提高。用EPDM-g-MAH对TPU/WF复合材料进行改性后，材料的拉伸性能也得到了很大的提高。
Using three-dimensional (3D) printing technology, the wood flour (WF)/thermoplastic polyurethane (TPU) composites with different contents of WF and different modifiers were prepared by TPU/WF composite filaments. These filaments were fabricated through the melt-blending and melt-extrusion of TPU and WF. The mechanical properties, microtopography and chemical structures of the 3D printing products were examined by the mechanical testing machine, scanning electron microscopy (SEM), Fourier transformed infrared (FTIR), Xray photoelectron spectroscopy (XPS), and rheological property tester. The results showed that the tear elongation decreased gradually as the WF content increased, and the tensile strength firstly decreased and then increased. SEM and FTIR results revealed a good compatibility between TPU and WF after the modification with EPDM-g-MAH. The XPS results indicated that the diphenylmethyl propane diisocyanate (MDI) and EPDM-g-MAH modification positively affected the interfacial bonding property between WF and TPU. The examination of rheological properties of the TPU/WF composites indicated that the storage modulus, loss modulus and complex viscosity were significantly increased after the modification with EPDM-g-MAH. The tensile properties of the TPU/WF composites were also greatly increased after the modification with EPDM-g-MAH.