Chemours in the Semicon Manufacturing Industry
Teflon™ PFA HP Plus—Same chemistry as Teflon™ PFA HP
Teflon™ PFA HP Plus was developed to provide the same inert, fully fluorinated structure and lowest level of reactive end groups as Teflon™ PFA HP. This combination is important not only for performance reasons, but also minimizes end users’ evaluation and qualification expenditures.
Teflon™ PFA HP Plus, like Teflon™ PFA HP, contains only fluorine—carbon bonds and the protected oxygen linking the pendant group. Both polymer generations are fully fluorinated to remove reactive end groups.
PFA HP Plus uses a lighter comonomer, linking a pendant group, as before, with a protected oxygen atom, to provide better flow when the polymer is melted. More of the lighter co-monomer is used to mechanically lock the molecules together in the solid structure, and to give the desired physical properties.
Most importantly, this specific comonomer influences the morphology of the solid polymer to bring about a toughened structure.
With similar basic chemistry, Teflon™ PFA HP Plus is in the class of fully fluorinated polymers—inert in semicon wet processing chemicals.
Teflon™ PFA HP Plus—Tougher mechanical structure
Chemours investigations have taught us that we can reconfigure the "morphology," the structure of the solid polymer, of Teflon™ PFA HP to provide the improved improved performance of Teflon™ PFA HP Plus.
When crystalline polymers solidify from the molten state to form a solid structure, they grow characteristic crystalline structures, called spherulites for their roundish shape. This spherulitic structure is depicted in the drawings in this chart, with the spherulites depicted as circles representing a cross section of polymer.
Chemours has learned that smaller spherulites in polymers contributes to increased toughness. We believe that the effect occurs because the closer packing reduces regions of comparative weakness between the spherulites.
Chemours has developed small spherulites in polymers by nucleating the polymer crystallization, a technology which leads to the simultaneous growth of crystals.
With PFA HP Plus, our investigations defined the weight and amount of comonomer such that we can both develop very small spherulites AND also toughen the regions between spherulites.