Perfluoroelastomer MVE Content Optimization for High-Temperature Sealing
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Solution Overview
Problem
Current perfluoroelastomers face challenges in achieving optimal thermal resistance and sealing properties at high temperatures, particularly above 200°C, despite their advanced chemical resistance.
Innovation Solution
A peroxide-curable perfluoroelastomer composition comprising recurring units from tetrafluoroethylene (TFE) and perfluoromethylvinylether (MVE) with a specific Mooney Viscosity range and MVE content, along with minor amounts of per(halo)fluoromonomers and iodine/bromine atoms, enhancing molecular weight and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MVE content is increased to improve elastomeric behavior, then the sealing properties improve, but the thermal resistance at high temperatures deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the MVE content within the narrow range of 26-33% and the Mooney viscosity within 25-140 MU. This optimization balances the elastomeric behavior needed for sealing with the thermal stability required for high-temperature resistance, resolving the contradiction between these two properties.
2Temperature
If the MVE content is decreased to improve thermal resistance, then the thermal stability improves, but the elastomeric behavior and sealing properties deteriorate
Solution Approach 1:
The patent maintains thermal resistance while preserving sealing properties by adjusting the MVE content to a specific range (26-33%) and controlling the Mooney viscosity (25-140 MU). This parameter optimization ensures sufficient elastomeric behavior for sealing without compromising thermal stability.
3Strength
If the molecular weight is increased to improve mechanical strength, then the processing difficulty increases
Solution Approach 1:
The patent controls molecular weight by specifying Mooney viscosity within 25-140 MU, which balances mechanical strength with processability. This parameter control allows the perfluoroelastomer to achieve adequate mechanical properties while remaining suitable for conventional peroxide curing and molding processes.
Data Source
AI summary
A peroxide curable perfluoroelastomer comprising: recurring units derived from tetrafluoroethylene (TFE); and recurring units derived from perfluoromethylvinylether (MVE); such perfluoroelastomer possessing a Mooney Viscosity (ML2+9) at 121° C. of from 25 to 140 MU, when measured according to ASTM D1646 standard, and comprising such MVE recurring units in an amount of from 26 to 33% by moles with respect to total moles of TFE and MVE. A process for the manufacture of such perfluoroelastomer, and cured articles obtainable therefrom.