PVDF foam sheet has multiple excellent properties such as elasticity, low weight, low thermal conductivity, high chemical corrosion resistance, and heat resistance. PVDF is often used to make insulation sheaths for electric wires. Thin 30-gauge wire, which is often used in wound circuits, and PVDF insulation is commonly used in printed circuit boards. Cables with PVDF insulation are often referred to as "Kynar wires" under the PVDF trade name.
Due to its piezoelectric properties, PVDF is commonly used to produce tactile sensor arrays, inexpensive strain gauges, and lightweight audio transducers.
PVDF is also a standard binder for composite electrodes of lithium batteries: PVDF dissolved in N-methyl-2-pyrrolidone (NMP) with a specific gravity of 1-2% and graphite, silicon, tin, LiCoO2, LiMn2O4 or LiFePO4 such active The lithium storage material is mixed with conductive additives such as carbon black or carbon nanofibers, and then the slurry is cast on a metal current collector and the NMP is evaporated to form a composite electrode or a paste electrode. PVDF can be used for this purpose because it is chemically inert and does not react with the electrolyte or lithium in the potential range of battery charge and discharge.
In the biomedical field, PVDF membranes are commonly used in western blotting, on which proteins are electrophoresed. Because PVDF is resistant to solvents, the films used in the assay can be easily peeled off and reused to detect other proteins. PVDF membranes can also be used to make syringe-type or wheel-type membrane filtration devices. The heat resistance, chemical resistance, and low protein binding properties of this material allow it to be used as a sterile filter in the preparation of pharmaceuticals, and it can also be used as a filter in sample preparation for analysis such as HPLC, preventing expensive of equipment were damaged by the small amount of particulate matter in these samples.
PVDF can also be used to make monofilament fishing lines to replace traditional nylon monofilaments, because its surface hardness is higher than that of nylon and polyethylene, and it is more resistant to abrasion when facing underwater branches, rocks and sharp fish teeth; the refractive index and water The similarity makes the fishing line more difficult to be found by fish eyes; the water absorption ductility, stretchability and memory are lower than that of nylon, but higher than that of braided line, and it is less likely to break when dealing with the sudden impact during fishing; at the same time Its specific gravity is larger than that of nylon, so that the fishing line can sink toward the fish faster, so it is often used as a guide.
Compared with semiconductor piezoresistive sensors, PVDF sensors are more suitable for dynamic modal testing, and have certain advantages over piezoelectric ceramic transducers in terms of structural integration. Active sensors using PVDF are important for the future development of structural health monitoring due to lower cost and greater compatibility.
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