Plasma modification of plastic sheet
DATE：2021/4/20 8:14:44 / READ： / SOURCE：This station
Plasma modification of plastic sheet
Plastic sheet production line www.handern.com
① The surface reaction is carried out by plasma of nonpolymeric gases (inorganic gases), such as AR, h, 02, N2 and? Air. Excited atoms, molecules, free radicals, ions and photons are involved in the surface reaction. Through the surface reaction, it is possible to introduce specific functional groups on the polymer surface, resulting in surface etching, forming cross-linked structural layers or free radicals. Plastic sheet production line www.handern.com② Plasma polymerization was carried out by using organic gas monomer. Plasma polymerization refers to the evaporation of organic matter. Plasma is formed in the gas, and the gas-phase free radicals are adsorbed on the solid surface to form surface free radicals, and then polymerize with the gas-phase monomer or monomer derivatives formed in the plasma on the surface to form polymer films with high molecular weight. Plastic sheet production line www.handern.com
③ Plasma initiated polymerization or surface grafting. First, the surface of polymer material was treated by plasma with nonpolymeric gas, then the surface of ABS was treated with chromium to form active free radical [this -? - point has been confirmed by many experiments, the surface free radical can be fixed by electron paramagnetic resonance, which is conducive to the determination of spray coating ((ESR)), and then the active free radical was used to initiate the polymerization or grafting of functional monomer on the surface. There are three methods of surface grafting initiated by plasma: first, the surface is treated by plasma, and then the vaporized monomer is contacted for grafting polymerization, namely gas phase method. Because of the low concentration of monomers, this method has less chance to contact with the surface active points of materials and low grafting rate. The surface of the material was treated by plasma, and then directly grafted into the liquid monomer without contacting with air. In the 1950s, the gas-liquid method was used. This method can improve the grafting rate, but at the same time produce homopolymer and affect the effect. Thirdly, the surface of the material is treated by plasma, rubber and other materials, and then comes into contact with the atmosphere to form peroxides, which are then put into the solution monomer and decomposed into active free radicals,
The thickness of the branch layer can be determined by the normal pressure liquid phase method. In addition, the plasma grafting polymerization can also be carried out by "simultaneous irradiation", that is, the monomer is adsorbed on the surface of the material, and then exposed to the plasma for grafting during the treatment.
Fluorinated polymers such as FEP and PTFE? Have excellent chemical stability, heat resistance, electrical properties and resistance to water vapor penetration. They are widely used in chemical, electronic industry and medical devices. However, their poor wettability and adhesion limit their application System. For example, the tensile strength can reach 7.7 ~ 14MPa, the bulk structure of the material has no change, and the surface resistance and dielectric loss of the material have no change. It should be pointed out that this method still has the following shortcomings: ① the color of the colored wire is affected by the surface sticking of the treated material; ② the surface resistance decreases slightly under high humidity; ③ the treated surface is exposed to sunlight. When heated, the adhesive properties decrease. Plastic sheet production line www.handern.com
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