Microfiltration polytetrafluoroethylene

Polymeric membranes are prepared from a variety of materials using several different production techniques. Table 5 summarizes a partial list of the various polymer materials used in the manufacture of cross-flow filters for both MF and UF applications. For microfiltration applications, typically symmetric membranes are used. Examples include polyethylene, polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE) membrane. These can be produced by stretching, molding and sintering finegrained and partially crystalline polymers. Polyester and polycarbonate membranes are made using irradiation and etching processes and polymers such as polypropylene, polyamide, cellulose acetate and polysulfone membranes are produced by the phase inversion process.f Jf f ... 

Polymers commonly used to make such microfiltration membranes are polyvinylidene fluoride (PVDF), Nylon 66, polytetrafluoroethylene (PTFE), polysuUbne, cellulose, cellulose acetate/cellulose nitrate, polypropylene (PP), polyester, polycarbonate, etc. Ceramic microfiltration membranes are not uncommon. Polymeric membranes may have the following stmctures. 

---