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Locally Controllable Surface Foaming of Polymers Induced by Graphene via Near-Infrared Pulsed Laser
ACS Sustainable Chemistry & Engineering ( IF 8.4 ) Pub Date : 2020-02-04 , DOI: 10.1021/acssuschemeng.9b07046
Liyang Jia 1 , Jihai Zhang 1 , Gehong Su 1 , Zhuo Zheng 1 , Tao Zhou 1
Affiliation  

Our study proposed an efficient and environment-friendly strategy to realize the locally controllable surface foaming on polymers via a near-infrared pulsed laser. This laser foaming was induced by the multilayer graphene (MLG), and only 0.05 wt % MLG gave the polymer an excellent foaming performance with good smoothness and a foaming height of 0.41 mm. Benefited from programming and automatically controlling the laser system, foamed patterns of arbitrary shapes with three-dimensional appearance could be accurately written on the polymer surface. Scanning electron microscopy confirmed that the uniform cells produced by laser foaming were mainly ellipsoidal with closed-cell structures (D = 31.5 μm); moreover, the surface foam had three layers with a total thickness of 633.7 μm. X-ray photoelectron spectroscopy (XPS) revealed the surface carbonization of the foam during laser foaming. Both attenuated total reflection Fourier transform infrared spectroscopy and XPS confirmed the weak oxidation of the polypropylene (PP) matrix caused by laser because of the appearance of C–O and C═O groups on foams. Besides, the Raman depth imaging demonstrated the layered carbonization distribution in the foam surface. The micro-Raman spectroscopy confirmed that the amorphous carbon and the sp/sp2 carbon (C≡C/C═C) were two main carbonized products of PP. This study also proposed the mechanism of polymer laser foaming induced by MLG.

中文翻译:

石墨烯通过近红外脉冲激光诱导的聚合物的局部可控表面起泡

我们的研究提出了一种有效且环保的策略,以通过近红外脉冲激光在聚合物上实现局部可控的表面发泡。该激光发泡是由多层石墨烯(MLG)引起的,并且仅0.05重量%的MLG使聚合物具有优异的发泡性能,良好的光滑度和0.41mm的发泡高度。得益于对激光系统的编程和自动控制,可以将具有三维外观的任意形状的泡沫状图案准确地写在聚合物表面上。扫描电子显微镜证实,由激光发泡产生的均匀泡孔主要为椭圆形,具有闭孔结构(D= 31.5微米);此外,表面泡沫具有三层,总厚度为633.7μm。X射线光电子能谱(XPS)显示了激光发泡过程中泡沫的表面碳化。衰减全反射傅立叶变换红外光谱和XPS均证实了激光引起的聚丙烯(PP)基体的弱氧化,这是因为泡沫中出现了C–O和C═O基团。此外,拉曼深度成像显示了泡沫表面的分层碳化分布。显微拉曼光谱证实无定形碳和sp / sp 2碳(C≡C/C═C)是PP的两个主要碳化产物。该研究还提出了MLG引起的聚合物激光发泡的机理。
更新日期:2020-02-06
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