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Surface plasma treatment equipment low-temperature nitrogen plasma modified PAN film and its anti-pollution properties

Keywords:

low-temperature,nitrogen,plasma

Published on:

06 Aug,2021

Surface plasma treatment equipment low-temperature nitrogen plasma modified PAN film and its anti-pollution properties:
With the rapid development of membrane science and technology, it is difficult for a single membrane material to meet actual needs, such as chemical stability, corrosion resistance, hydrophilicity, and pollution resistance. Therefore, it is necessary to physically or chemically modify the membrane material to improve Its comprehensive performance. Polyacrylonitrile (PAN) has become a widely used ultrafiltration membrane material because of its excellent chemical stability, thermal stability and bacterial resistance. It has entered the practical stage in the fields of food, pharmaceutical fermentation, oil-water separation, emulsion concentration, and paint recovery.

low-temperature nitrogen plasma   However, because the polyacrylonitrile membrane has poor hydrophilicity and is easily contaminated by macromolecules such as protein solutions, it is imperative to modify the polyacrylonitrile membrane to improve its separation efficiency, performance and extend its service life. Surface plasma treatment equipment Plasma is a gaseous treatment technology that combines physics and chemistry. It acts in the nanometer range of the surface of the membrane material and does not affect the body characteristics of the membrane. The modification process is pollution-free and simple and quick to operate. It has been obtained in the society Rapid development.
Surface plasma treatment equipment low-temperature plasma modified membrane, the flow of clean water increased, the Zeta potential of the membrane surface and membrane pores increased by 69.4% and 58.66%, respectively, the surface plasma treatment equipment low-temperature plasma technology surface modified polyacrylonitrile ( PAN) ultrafiltration membrane, and vapor phase grafted acrylic monomer (AA) method to improve the anti-fouling performance of the membrane.
  Using atmospheric pressure dielectric barrier discharge plasma technology, the surface of the polyacrylonitrile ultrafiltration membrane is grafted with acrylic acid and polyethylene glycol methacrylate containing hydrophilic groups to obtain a hydrophilic ultrafiltration membrane. The ultrafiltration membrane modified by DBD plasma has good anti-biological pollution performance.
   Under normal circumstances, the surface of the ultrafiltration membrane contains hydrophilic groups, the better the wettability of the membrane. As the discharge power gradually increased, the contact angle also increased and showed regular changes. This may be because with the increase of the discharge power, the dissociation degree and average energy of plasma active particles (free electrons, positive and negative ions, metastable atoms, free radicals, etc.) have increased, which is caused by the interaction with the film surface. The more active sites, the enhanced modification effect.
  Using surface plasma treatment equipment low temperature plasma modification to introduce hydrophilic groups on the surface of the membrane, the contact angle is reduced, and the hydrophilic properties of the PAN super membrane are improved. However, due to the poor timeliness of the plasma-modified ultrafiltration membrane, its hydrophilic properties will gradually decrease with time. Therefore, in order to overcome this shortcoming, gas phase grafting of acrylic monomers (AA) with hydrophilic structure is adopted, and the graft polymerization is carried out in the form of covalent bonds on the surface of the membrane, which can not only attract hydrophilic groups but also overcome the timeliness. , So that the ultrafiltration membrane can maintain its anti-pollution performance for a long time after modification.

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