SURFACE MODIFICATION OF FLUOROPOLYMERS

COF groups are formed by electron irradiation of PTFE [poly(tetrafluor oethylene)] powders in air, especially at the surface and in near-surf ace regions which can be easily hydrolysed to carboxyl groups by air h umidity. The application of special additives during irradiation leads to modified micropowders. Fourier transform infrared (FTIR) spectrosc opy enables the detection of carboxyl and COF groups, gamma-Irradiatio n of PTFE mainly causes degradation of the polymer; the concentration of carboxyl groups is much lower. Carboxylated micropowders created vi a radiation treatment retain the essential properties of PTFE. With in creasing radiation dose, the increasing concentration of functional gr oups in the micropowders causes an increase in the surface free energy . This diminishes the strong water and oil repellency of PTFE in such a way that homogeneous incorporation into aqueous and organic liquids or other polymers is possible. So, the special properties of PTFE can be made effective in these media. Modified PTFE micropowders have been successfully tested in many application areas. The aim of our present work was to increase the concentration and vary the nature of functio nal groups by radiation-chemical methods or chemical conversion of COF groups (polymer-analogous reactions). A highly modified PTFE powder w as used to reduce the repellent properties of PTFE diaphragms for appl ication in brine electrolysis. The COF groups of the micropowders were modified by gamma-aminopropyltriethoxysilane. The irradiation of FEP [poly(tetrafluoroethylene-co-hexafluoropropylene)] and PFA (tetrafluor oethylene-co-perfluoroalkylvinylether)] yields products which contain a higher content of carboxyl groups than PTFE.