Development of new nucleophile resistant vinylidene fluoride fluorocarbon elastomers

Vinylidene fluoride (VF2) fluorocarbon elastomers are weakened when they come into contact with stronger bases, a drawback that limits their application for sealing parts and other uses related to base additives. VF2 nucleophilic resistance can be improved by polymerizing the monomer mixture of VF2, tetrafluoroethylene and hexafluoropropylene. The monomer reduces acidic characters in hydrogen atoms and makes polymers less sensitive to nucleophiles. Productivity is enhanced through a micro-emulsion polymerization process. Chemical formulas are provided for these processes.
The most common vinylidene fluoride (VF2) based fluorocarbon elastomers are copolymers of VF2 with hexafluoropropylene (HFP) and terpolymers of VF2, HFP and tetrafluoroethylene (TFE) as the third monomer. These fluorocarbon [...]