Support material testing and equipment testing
Focus on R & D and manufacturer of plasma cleaning machine for 20 years
The effect of Ar/O_2 low-temperature plasma cleaning treatment on the bonding performance of high-density polyethylene-glass:
Polyethylene (PE), as a thermoplastic material, has excellent performance and is widely used. However, its bonding performance is poor, and its application in special fields is limited. Research on improving its bonding performance has become a hot spot.
Use Ar/O2 plasma to clean the HDPE film, observe the changes in its surface hydrophilicity, investigate the influence of different plasma treatment time, layering temperature and layering time on the bonding strength between HDPE film and silanized glass, and explore The bonding conditions between HDPE film and glass can achieve sufficient bonding between the two to expand its application in electrical materials, medical equipment and other fields.
HDPE film is not plasma cleaned, the surface contains a small amount of oxygen, which belongs to the surface adsorption of oxygen. After HDPE is treated with Ar/O2 plasma, the oxygen content on the surface of the material increases significantly; this shows that after HDPE is treated with Ar/O2 plasma, oxygen-containing functional groups are introduced on its surface. The oxygen-containing functional groups are mainly C-O, C=O, and O-C=O. It is the introduction of these oxygen-containing functional groups that improve the hydrophilicity of the HDPE membrane surface.
HDPE/APS glass bonding enhancement reason:
(1) Increase in free energy of substrate surface.
The surface energy of HDPE film is very low, the contact angle is large, and the adhesive cannot fully wet the substrate, so it cannot adhere to the substrate well. After the HDPE film is cleaned by plasma, polar groups such as -COOH and -OH are introduced on the surface of the film to reduce the surface contact angle, increase the hydrophilicity, and increase the free energy, which is conducive to the improvement of its bonding performance. .
(2) The surface roughness of the substrate is increased.
Plasma cleaning treatment has a slight etching effect on the HDPE surface, making the smooth surface rougher, and at the same time eliminating the weak boundary layer on the surface of the material, which is conducive to the improvement of its bonding performance.
(3) The formation of chemical bonds.
After HDPE is treated by Ar/O2 plasma, oxygen-containing functional groups can be introduced on its surface, which contains -COOH; the surface of the glass after Ar plasma cleaning and activation has -OH, the structural formula of APS is NH2C3H6Si(OC2H5)3, of which -OC2H5 The groups are prone to hydrolysis to form oligomers.
These oligomers can react with the -OH on the surface of the glass to form hydrogen bonds, which are dehydrated during the drying process to form a covalent bond to connect with the glass surface; the -NH2 exposed on the glass surface can chemically react with the -COOH on the surface of the HDPE film Function to form ammonium salt, under certain conditions, further form amide.
In this way, the silane coupling agent relies on the chemical bond formed at both ends to tightly connect the glass surface with the HDPE film by itself, thereby realizing the chemical bond between the glass surface and the HDPE film surface. Plasma cleaning significantly improves the interface bonding.
Plasma treatment equipment is also often used in the production of micro-motors to improve product performancemore >
Ultra-low temperature plasma equipment low temperature plasma technology to treat volatile organic compoundsmore >
Atmospheric pressure plasma cleaning equipment manufactured by Chengfeng Zhizhi introduces to you whether it is worthwhimore >
Chengfeng Zhizhi has the following suggestions for electrode maintenance of plasma vacuum cleaner equipmentmore >
Will the plasma surface cleaner produce corona discharge and spark dischargemore >
What is the composition of the AC contactor of the vacuum plasma surface treatment machine and how to choosemore >