PTFE films are made of the highest quality pure PTFE resin, which have outstanding performance and are additionally designed to meet demanding mechanical and chemical requirements. PTFE films are used to provide high temperature and chemical resistance materials in many applications.
Features of PTFE Film
- Ultra-low coefficient of friction and self-lubricating
- PTFE can work at temperatures up to 500°F
- Excellent chemical resistance
- PTFE is an excellent insulator
- Ultra-high purity
- Limitations: PTFE has low compressive and tensile strength
General Application Scenarios of PTFE Film
Capacitor films, cable harnesses, gaskets, electrical insulation parts, PCBs, flexible circuits, cap linings, plungers, plugs, protective linings, gaskets, diaphragms, semiconductor processing parts, expansion joint linings and sleeves, fuel cell seals and separators Panels, solar panel (photovoltaic) modules and surface protection liners.
- PTFE materials are widely used in many fields due to their excellent volume characteristics, such as low friction coefficient, high stability to heat and chemical reagents, and high electrical resistance. However, due to their poor wettability and adhesion with other materials, their application is hindered under certain circumstances. Therefore, it is necessary to develop different PTFE surface modification strategies to customize its surface properties for specific applications. For example, after the PTFE film is pretreated with remote argon plasma, acrylic acid (AAc) is grafted onto the surface, and then exposed to oxygen to generate peroxides, and the hydrophilicity of the PTFE film surface is greatly enhanced.
Figure 1. Schematic representation of the surface modification of PTFE films 
- PTFE film can be used as a substrate to prepare electret diaphragms for loudspeakers. The electret is a dielectric material that can capture the quasi-permanent space charge caused by the external charging process. In order to obtain a high-performance electret speaker, the electret diaphragm should have good charge storage capacity and light weight. Porous PTFE exhibits excellent dielectric properties, including high charge storage stability at high temperatures. However, the disadvantages of PTFE include difficult adhesion to the electrode layer, medium charge storage stability of high-porosity films, low elastic modulus and low stress, which hinder the further development of flexible electret speakers. Therefore, a porous PTFE film is used as a substrate, and a cyclic olefin copolymer (COC) is coated on the substrate to form a PTFE/COC composite film. Studies have shown that the composite material has improved advantageous properties and can be used to manufacture greatly improved electret diaphragms for flexible electret loudspeakers.
Figure 2. (a) SEM images of PTFE film and (b) SEM images of composite PTFE/COC 
- Chen Wang, Jie-Rong Chen, Applied Surface Science 253 (2007) 4599–4606.
- Wen-Ching Ko, Chien-Kai Tseng, Wen-Jong Wu, Chih-Kung Lee, e-Polymers 10 (2010) 032.
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