| dc.description.abstract | In this paper, PMMA/COC/CBC is used as the microfluidic substrate, and the micro-milling process is used for microfluidic manufacturing. Because there will be residual lines after micro-cutting, fewer scholars discuss the post-processing methods and post-processing effects of residual lines. The influence of microstructure. Therefore, this paper discusses the polishing process and the impact of polishing on mold replication.
The experimental design is divided into three stages. The first stage observes the effect of micro-milling processing and materials on the surface roughness, and uses the surface roughness of the test piece as an evaluation factor to find the most appropriate cutting parameters and materials. The experimental results show that PMMA has the best machinability, and the surface roughness is Ra=0.380 μm when the machining parameters are (Ø 0.2 mm, 1 mm/s, 30,000 rpm). The second stage is to use the displacement and deformation (preload) of the extrusion between the wool wheel and the material surface and the time for the acetone to melt the material to observe the effect of polishing on the surface roughness and microstructure. Find the most appropriate polishing parameter balance point in the structural distortion rate. The results of this experiment show that when the preload is 0.3 mm, the surface roughness of mechanical grinding and polishing is Ra=0.162 μm, and the microstructure distortion rate is about 14%, while the chemical melting polishing is when the polishing time is 4 min, the surface roughness is Ra=0.180 μm, the microstructure distortion rate is about 30%. The third stage is the impact of the replication method on the microfluidic device, comparing the impact of the mold structure on the surface roughness and microstructure after replication. The results of this experiment show that compared with the PDMS microfluidic device, the thermoplastic microfluidic device may cause a slight deformation of the microstructure due to thermal pressure, but the device has a higher bonding strength and a wider range of pressure applications. The PDMS microfluidic device can eliminate surface textures caused by processing to obtain better surface roughness when combined, and PDMS is an elastomer that can bend to a certain extent. | en_US |