Joo Hyeonseo, Cho Sunghun
School of Chemical Engineering, Yeungnam University, Gyeongsan 38541, Korea.
Polymers (Basel). 2020 Jan 2;12(1):67. doi: 10.3390/polym12010067.
Digital light processing (DLP)-type 3D printing ensures several advantages, such as an easy solution process, a short printing time, high-quality printing, and selective light curing. Furthermore, polyurethane (PU) is among the promising candidates for 3D printing because of its wide range of applications. This work reports comparative studies on the fabrication and optimization of PU composites using a polyaniline (PANI) nanomaterial and a graphene sheet (GS) for DLP-type 3D printing. The morphologies and dispersion of the printed PU composites were studied by field emission scanning electron microscope (FE-SEM) images. Bonding structures in the PU composites were investigated by Fourier-transform infrared (FT-IR) spectroscopy. As-prepared PU/PANI and PU/GS composites with different filler contents were successfully printed into sculptures with different sizes and shapes. The PU/PANI and PU/GS composites exhibit the improved sheet resistance, which is up to 8.57 × 10 times (1.19 × 10 ohm/sq) lower and 1.27 × 10 times (8.05 × 10 ohm/sq) lower, respectively, than the pristine PU (1.02 × 10 ohm/sq). Moreover, the PU/PANI and PU/GS composites demonstrate 1.41 times (44.5 MPa) higher and 2.19 times (69.3 MPa) higher tensile strengths compared with the pristine PU (31.6 MPa). This work suggests the potential uses of highly conductive PU composites for DLP-type 3D printing.
数字光处理（DLP）型3D打印具有诸多优势，如溶液制备过程简便、打印时间短、打印质量高以及选择性光固化等。此外，聚氨酯（PU）因其广泛的应用范围，是3D打印领域颇具潜力的材料之一。本文报道了使用聚苯胺（PANI）纳米材料和石墨烯片（GS）对用于DLP型3D打印的PU复合材料进行制备及优化的对比研究。通过场发射扫描电子显微镜（FE-SEM）图像研究了打印的PU复合材料的形态和分散情况。利用傅里叶变换红外（FT-IR）光谱研究了PU复合材料中的键合结构。将不同填料含量的PU/PANI和PU/GS复合材料成功打印成不同尺寸和形状的雕塑。与原始PU（1.02×10欧姆/平方）相比，PU/PANI和PU/GS复合材料的表面电阻分别降低了8.57×10倍（1.19×10欧姆/平方）和1.27×10倍（8.05×10欧姆/平方）。此外，与原始PU（31.6MPa）相比，PU/PANI和PU/GS复合材料的拉伸强度分别提高了1.41倍（44.5MPa）和2.19倍（69.3MPa）。这项工作表明了高导电性PU复合材料在DLP型3D打印中的潜在用途。
