Characteristic
1. Mechanical properties
PVDF has high mechanical strength and excellent toughness, and can maintain structural stability under high mechanical stress conditions. For example, its tensile strength can reach 50 MPa, the elongation at break is between 10% and 200%, the bending strength can reach 80 MPa, and the bending modulus is 2000 MPa. In addition, PVDF still exhibits excellent impact resistance and toughness at low temperatures, making it suitable for use in low-temperature environments.
2. Chemical corrosion resistance
PVDF has strong corrosion resistance to many chemicals, and can resist acid, alkali, salt solutions, and most organic solvents. However, it has poor tolerance to strong alkaline amines, strong polar solvents such as ketones and esters, and molten alkali metals. This excellent chemical stability makes it an ideal material for the chemical, semiconductor, and food processing industries.
3. Heat resistance and thermal stability
PVDF has a continuous working temperature range of -40 ° C to 150 ° C, with a short-term working temperature of up to 180 ° C. Its melting point is about 172 ° C, and its thermal deformation temperature is between 110-145 ° C, demonstrating excellent thermal stability. At high temperatures, PVDF is not easily deformed or melted, and has a low coefficient of thermal expansion [0.67+1.00 × 10 ^ -4 in/in/° F], which allows it to maintain structural stability in high temperature environments.
4. Electrical properties
PVDF has high dielectric strength and low dielectric loss, making it suitable for electrical applications that require high non-conductive performance. Its volume resistivity can reach 10 ^ 14 Ω· cm, breakdown voltage can reach up to 10 kV/mm, and it exhibits stable non-conductive performance at different frequencies. In addition, PVDF also has piezoelectric and thermoelectric properties, making it widely used in sensors and energy harvesting devices.
5. Weather resistance and aging resistance
PVDF has outstanding weather resistance and can be exposed to natural environments such as sunlight and rain for a long time without any performance degradation. Its surface is smooth, not prone to aging, and has excellent resistance to ultraviolet and radiation. This characteristic makes it have a wide range of potential applications in architecture, outdoor equipment, and components.
6. Processing performance
PVDF is a thermoplastic material that can be formed through traditional plastic processing methods such as extrusion, injection, hot pressing, and welding. It has excellent processing performance and does not require additional drying treatment. In addition, PVDF has a wide range of molding temperatures, with extrusion temperatures between 180-265 ° C and mold temperatures between 60-90 ° C.
7. Flame retardancy
PVDF has self extinguishing properties and an oxygen index of 40%, making it a flame-retardant material suitable for applications with high fire protection requirements.
8. Special performance
Piezoelectricity: PVDF has a significant piezoelectric effect, which can convert mechanical energy into electrical energy, and vice versa. This characteristic makes it highly useful in sensors, ultrasonic transducers, and energy harvesting devices.
Radiation resistance: PVDF has excellent resistance to high-energy radiation (such as gamma rays and ultraviolet rays) and is suitable for the nuclear and aerospace industries.
Low friction coefficient: PVDF has a low friction coefficient and self-lubricating properties, making it suitable for low friction and wear-resistant applications.
Application Area
Due to its excellent comprehensive performance, PVDF is widely used in the following industries:
-Chemical industry: used for corrosion-resistant equipment of pipelines, valves, and pump components.
-Electrical: Used for non-conductive materials, cable sheaths, sensors.
-Architecture: Used for curtain walls, roof materials, and waterproof coatings.
-Medical: Used for medical devices, sensors, and implants.
-Aerospace: used for structural components and seals.
-New energy: used for solar panel backplates and fuel cells.
PVDF is a material with excellent mechanical properties, chemical corrosion resistance, heat resistance, and electrical properties, suitable for many industrial industries. Its special piezoelectricity and radiation resistance make it very useful in sensors and energy harvesting devices. Due to its excellent processing performance and environmental characteristics, PVDF plays an increasingly important role in modern industry.
