Laser-Marking Mechanism of Thermoplastic Polyurethane/Bi2O3 Composites

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• 作者：Wei Zhong ; Zheng Cao ; Pengfei Qiu ; Dun Wu ; Chunlin Liu ; Huili Li ; He Zhu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：7
• 期：43
• 页码：24142-24149
• 全文大小：481K
• ISSN：1944-8252

文摘

Using bismuth oxide (Bi₂O₃) as a laser-marking additive and thermoplastic polyurethane (TPU) as the matrix, TPU/Bi₂O₃ composite materials were prepared by melt blending in a torque rheometer. The sheet samples prepared from the TPU/Bi₂O₃ composites were treated in air by scanning with a neodymium-doped yttrium aluminum garnet (Nd: YAG) pulsed laser beam at a wavelength of 1064 nm. Compared with the pure TPU sample, the laser-marked composite samples exhibited differences in marking contrast as the Bi₂O₃ content increased from 0.1% to 1.0% based on stereomicroscope analysis. Scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectroscopy, thermogravimetry analysis, and X-ray diffraction were used to characterize the laser-marked surface material of the composite samples. Furthermore, a mechanism for the laser-effected darkening of the TPU/Bi₂O₃ composites was proposed. The results herein indicated that the addition of the Bi₂O₃ laser-sensitive additive to TPU resulted in laser darkening of the TPU/Bi₂O₃ composites. The marking contrast and visual appearance of the surface of the TPU/Bi₂O₃ composites after laser irradiation was due to a synergistic effect consisting of carbonization via TPU pyrolysis and reduction of Bi₂O₃ to black bismuth metal.