PVDF

Polyvinylidene fluoride (PVDF) is a semi-crystalline polymer synthesized by the polymerization of H₂C=CF₂ monomers. The spatial arrangement of CH₂ and CF₂ groups along the polymer chain determines the unique polarity, unusually high dielectric constant, polymorphism and high piezoelectric and pyroelectric activity of the polymer. As the most popular polymer in the fluoropolymer family, PVDF has been used in a wide range of high-tech applications such as chemical processing equipment, electrical and electronic, and energy-related applications.

Figure 1. Vector ball-and-stick model of thermoplastic fluorocarbon polymer PVDF.

Alfa Chemistry is a leading global supplier of PVDF. We are committed to providing you with different specifications of high-quality PVDF to meet your scientific or industrial applications. Contact us today to discuss your specific needs and let our experts guide you to find the perfect solution to drive your project to success.

How to Make PVDF

PVDF is manufactured by free radical polymerization of 1,1-difluoroethylene (CH₂=CF₂). The polymerization takes place in the suspension or emulsion. The operating pressure of the polymerization can be from 1 to 20 MPa (10-200 atm), and the temperature can be from 10 to 130 °C.

Performance Characteristics

Firstly, PVDF has excellent piezoelectric properties. Compared with traditional piezoelectric materials, it has a wide frequency bandwidth and high sensitivity of power-to-electricity conversion. Secondly, compared with softer and mechanically less robust perfluorocarbon polymers, PVDF has high mechanical and impact strength and excellent creep resistance under long-term stress and fatigue upon cyclic loading. Finally, PVDF has good machinability, excellent wear resistance, and chemical resistance to different materials such as organic acids, oils, aliphatic and aromatic hydrocarbons, alcohols, and halogenated solvents.

Applications

The excellent properties of PVDF make it a satisfactory material for practical applications. The following are some common applications of PVDF:

• Coatings: PVDF is known for its exceptional chemical resistance, weatherability, and UV resistance. It is used as a coating material for architectural structures, automotive parts, outdoor signage, and other surfaces that require long-lasting protection against harsh environmental conditions.
• Piezoelectric Devices: PVDF exhibits piezoelectric properties, meaning it can generate an electrical charge in response to mechanical stress or pressure. It is used in sensors, transducers, actuators, and various electromechanical devices.
• Membranes: PVDF membranes have high porosity, chemical resistance, and thermal stability. They are used in filtration applications, such as water treatment, gas separation, and blood filtration.
• Li-ion Batteries: PVDF is used as a binder material in the fabrication of lithium-ion battery electrodes. It helps hold active materials together and enhances the adhesion between electrodes and current collectors, improving the overall performance and stability of the battery.

Our Products

Alfa Chemistry provides customers with PVDF in different material forms. The specific products are as follows: 

PVDF Sheets & Rods

PVDF Films

PVDF Granules & Balls

PVDF Powders