PEN flexible ITO conductive film-Square resistance: 6-8 ohms Transmittance: ≥ 80.0% Film thickness: 0.125mm Temperature resistance: 200 ℃
Product Specification: 300 * 100mm Unit Price: 200 yuan/sheet Width: 300MM
The mechanical properties of polytetrafluoroethylene are relatively soft. Has very low surface energy.
Polytetrafluoroethylene has a series of excellent performance characteristics:
High temperature resistance: long-term use temperature of 200-260 degrees;
Low temperature resistance: still soft at -100 degrees;
Corrosion resistance: able to withstand aqua regia and all organic solvents;
Climate resistance: the best aging life among plastics;
High lubrication: has the smallest friction coefficient among plastics (0.04);
Non stickiness: having the smallest surface tension among solid materials without adhering to any substance;
Non toxic: possessing physiological inertness; Excellent electrical performance, it is an ideal C-class insulation material, and a thick layer of newspaper can block high voltage of 1500V; Even smoother than ice.
The friction coefficient of polytetrafluoroethylene is extremely small, only 1/5 of that of polyethylene, which is an important feature of perfluorocarbon surfaces. Due to the extremely low intermolecular forces between fluorine carbon chains, polytetrafluoroethylene has non adhesiveness. Polytetrafluoroethylene maintains excellent mechanical properties over a wide temperature range of -196 to 260 ℃, and one of the characteristics of perfluorocarbon polymers is that they remain brittle at low temperatures. PTFE has a high density of 2.14-2.20g/cm and is almost non absorbent, with an equilibrium water absorption rate of less than 0.01%. Polytetrafluoroethylene is a typical soft and weak polymer with low intermolecular attraction, low stiffness, hardness, and strength. It will deform under long-term stress.
Polytetrafluoroethylene is prone to creep under load and is a typical plastic with cold flow properties. The creep of PTFE varies with different compressive stress, temperature, and crystallinity, and the higher the temperature, the greater the creep. The crystallinity of PTFE is between 55% and 80%, and the creep rate does not exceed 2%; When the crystallinity is below 55% and above 80%, the creep rate increases rapidly. The excellent mechanical properties of polytetrafluoroethylene are its low friction coefficient, ranging from 0.01 to 0.10, which is the smallest among existing plastic materials and even all engineering materials.
The friction coefficient of PTFE increases with the increase of sliding rate, and tends to stabilize when the linear velocity reaches 0.5-1.0m/s or above; Moreover, the static friction coefficient is lower than the dynamic friction coefficient. Using this characteristic in bearing manufacturing can reduce its starting resistance, making it very smooth from starting to operation. The friction coefficient of PTFE decreases with increasing load and tends to be constant when the load reaches 0.8 MPa or above. At high speeds and high loads, the friction coefficient of PTFE is less than 0.01. From ultra-low temperature to the melting point of PTFE, its friction coefficient remains almost unchanged, and only increases sharply when the surface temperature is above the melting point. Due to the small intermolecular attraction, PTFE has low hardness and is easily worn by other materials. However, as long as the surface roughness of the grinding material is appropriate, it can significantly reduce the wear of PTEF.
Polytetrafluoroethylene has extremely high chemical corrosion resistance, such as when boiled in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even aqua regia. Its weight and properties remain unchanged, and it is almost insoluble in most solvents, only slightly soluble in alkanes above 300 ℃ (about 0.1g/100g). Polytetrafluoroethylene is non hygroscopic, non flammable, and extremely stable to oxygen and ultraviolet radiation, thus possessing excellent weather resistance. It is worth noting that polytetrafluoroethylene cannot withstand strong reducing atmospheres. Molten alkali metals, ammonia alkali solutions (alkali metals dissolve in liquid ammonia), certain fluorides (such as TFA), naphthalene sodium salts, etc. can quickly corrode polytetrafluoroethylene products. Polytetrafluoroethylene has low dielectric constant and dielectric loss over a wide frequency range, and high breakdown voltage, volume resistivity, and arc resistance.
The radiation resistance of polytetrafluoroethylene is poor, and it degrades when exposed to high-energy radiation, resulting in a significant decrease in the electrical and mechanical properties of the polymer. Polytetrafluoroethylene is produced by free radical polymerization of tetrafluoroethylene. The polymerization reaction in industry is carried out by stirring in the presence of a large amount of water to disperse the reaction heat and facilitate temperature control. Aggregation is generally carried out at 40-80 ℃ and 3-26 kg force/cm pressure. Inorganic persulfates and organic peroxides can be used as initiators, or redox initiation systems can be employed. Each mole of tetrafluoroethylene releases 171.38 kJ of heat during polymerization. Dispersion polymerization requires the addition of perfluorinated surfactants, such as perfluorooctanoic acid or its salts.
This product can be easily cut with scissors!
