Kameyama Nobukazu, Yoshida Hiroki
Department of Electrical, Electronic and Computer Engineering, Faculty of Engineering, Gifu University, 1-1 Yanagito, Gifu City 501-1193, Japan.
Polymers (Basel). 2022 Aug 26;14(17):3508. doi: 10.3390/polym14173508.
A method that makes polymer sheets partially thinner with continuous-wave carbon dioxide (CO) lasers has been developed. This method can create thin polymer films by attaching the polymer sheets to the copper base by vacuum suction through the holes in the base. Applying the method to polypropylene (PP), polyethylene terephthalate (PET), polystyrene (PS), and polytetrafluoroethylene (PTFE), the thin-film formation is confirmed in PP, PET, and PS but not PTFE. These polymers have the similar thermal properties. PP, PET, and PS show fluidity with increased temperature, but PTFE does not have fluidity. These characteristics of the polymers indicate that the fluidity of polymer is the important characteristic for film formation. The experiments with PP and PET sheets of different thickness show that thicker sheets make thicker films. The fluid flow of the molten polymer is considered to form the thin film at the bottom of the groove made by laser scribing. The numerical simulation of the 2D thermal model also indicates the week cooling effects of the base on the film formation and importance of polymer fluidity. The results of Fourier transform infrared spectrometer (FT-IR) show thermal degradation of the films. To decrease the heat's effect on the films, the polymer sheets should be processed at the highest laser-beam scanning speed that can make thin films.
已开发出一种使用连续波二氧化碳（CO）激光使聚合物片材部分变薄的方法。该方法可通过将聚合物片材通过基座上的孔进行真空抽吸而附着到铜基座上，从而制造出聚合物薄膜。将该方法应用于聚丙烯（PP）、聚对苯二甲酸乙二酯（PET）、聚苯乙烯（PS）和聚四氟乙烯（PTFE）时，在PP、PET和PS中证实了薄膜的形成，但在PTFE中未证实。这些聚合物具有相似的热性能。PP、PET和PS随着温度升高表现出流动性，但PTFE没有流动性。聚合物的这些特性表明聚合物的流动性是成膜的重要特性。对不同厚度的PP和PET片材进行的实验表明，较厚的片材会形成较厚的薄膜。熔融聚合物的流体流动被认为是在激光划刻形成的凹槽底部形成薄膜的原因。二维热模型的数值模拟也表明基座对成膜的冷却作用较弱以及聚合物流动性的重要性。傅里叶变换红外光谱仪（FT - IR）的结果显示了薄膜的热降解。为了减少热量对薄膜的影响，聚合物片材应以能够制造薄膜的最高激光束扫描速度进行加工。
