| Name | polymer electret |
| Synonyms | polymer electret |
| Physical and Chemical Properties | Chemical properties The polymer electret is to polarize the polymer electrolyte in a high-voltage electric field, and then cool the frozen polarization charge to obtain electrostatic permanent polarization. This kind of electrolyte with a frozen long-life non-equilibrium moment is collectively called polymer electret. The polymers used for polymer electrets include polyvinylidene fluoride, polyethylene terephthalate polytetrafluoroethylene, fluorinated ethylene polymer, polypropylene, polycarbonate and other ultra-thin film electrets. |
| Use | Used for assembling filters, audio, microphones, headsets, audio films, electrostatic engines, alternator electret motors; potentiometers, voltmeters, high-voltage power supplies, anti-blood materials, etc. |
Manufacturing the electret can be divided into the following steps.
The first step: first excite the material, that is, the polymer film is sandwiched in two electrodes and heated to the temperature at which the film is formed.
Step 2: On the thin film electrode system, an external electric field (the electric field strength is several tens of V/cm) is applied to polarize the polymer film, and finally the charge is polarized by cold junction, I .e. under the action of the electric field, the film is cooled until room temperature and then the electric field is withdrawn. At 90 ℃, 10 μm PVDF fiber is mixed with 50kV/mm glass fiber and polyvinyl chloride fiber in the same amount to form a 2, the layer is pasted on both sides of a 220mm round frame to form filter elements, and then 10 groups are assembled to form a filter.