PVDFcohexafluoropropylene

PVDF-co-hexafluoropropylene, commonly referred to as PVDF-HFP, is a fluoropolymer copolymer of vinylidene fluoride (VDF) and hexafluoropropylene (HFP). This random copolymer combines the chemical resistance, thermal stability, and mechanical strength of polyvinylidene fluoride with the increased flexibility and improved processability imparted by the hexafluoropropylene comonomer. The HFP content can vary, typically in the 10–40 mole percent range, which allows tuning of crystallinity, glass transition temperature, and mechanical properties.

PVDF-HFP exhibits high chemical resistance to acids, bases, and many organic solvents, and maintains performance under elevated temperatures. It generally shows lower crystallinity and a broader processing window than PVDF homopolymers, contributing to enhanced flexibility and easier processing. The copolymer also has favorable dielectric properties and good weathering resistance, though its surface energy remains relatively low due to fluorine content. Processing methods include melt extrusion, solution casting, and solvent-based film or coating fabrication, enabling production of films, coatings, membranes, and composite materials.

Applications of PVDF-HFP are diverse. It is used in chemical-processing equipment linings and protective coatings, corrosion-resistant piping and fittings, and as a key material in filtration membranes for water treatment, gas separation, and pervaporation. In energy storage, PVDF-HFP serves as a binder or electrolyte-supporting matrix in lithium-ion and lithium-metal battery technologies, where its flexibility and compatibility with plasticizers aid in forming gel or solid-state electrolytes. Safety and handling follow standard polymer guidelines; PVDF-HFP is generally considered chemically inert under routine conditions and is produced in various grades tailored to membranes, coatings, or battery applications.