High-Temp Epitaxial Co-Crystalline (ECC) Perfluoropolymer Resins

Jacob Lahijani, Maria P.-Samija, George M. Pruce, John L. Netta


DuPont has developed a new class of high-temperature, meltprocessible perfluoropolymers. This new class demonstrates all of the beneficial properties typical of perfluoropolymers, including chemical resistance, permeation resistance, low dielectric constant, low dissipation factor, and low coefficient-of-friction. However, the new class has enhanced functionality, which primarily results from epitaxial co-crystallization (ECC) within the polymer during post-heat treatment at temperatures approaching 300o C. The melting point for this new resin, prior to heat treatment, is approximately 320°C.

The new high-temperature perfluoropolymer (HTP) resin targets extreme applications requiring a high-temperature rating of up to 300o C in combination with excellent electrical properties and/or chemical resistance. The HTP resin can be melt-processed using standard high-temperature fluoropolymer equipment and at standard operating speeds. In addition, the processing window is large; wire constructions from 5 mils on AWG 30 gauge to 75 mils on AWG 4 gauge have been routinely produced. HTP resin, and products made from it, demonstrate enhanced properties (i.e., modulus retention, improved fatigue resistance, better permeation resistance and higher melting point) when subjected to a post-heat treatment. Qualification trials are underway in a number of applications in the oil and gas, semiconductor, military/aerospace and CPI industries.

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