Perfluorinated Thermoplastic Elastomer Shear Thinning 3D Printing
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Solution Overview
Problem
Perfluorinated polymers used in 3D printing require high temperatures for processing, leading to thermal degradation and the release of harmful chemicals, which poses challenges in terms of chemical resistance, corrosion, and material compatibility.
Innovation Solution
Development of perfluorinated thermoplastic elastomers with specific block copolymer structures comprising recurring units from tetrafluoroethylene and other perfluorinated monomers, offering improved processability, shear thinning properties, and reduced degradation, allowing for lower processing temperatures while maintaining chemical and thermal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If perfluorinated polymers are processed at high temperatures (200-450°C) to achieve proper flow and deposition, then the material displays sufficient melt flow and adhesion, but thermal degradation occurs leading to release of harmful chemicals (HF and other acids)
Solution Approach 1:
The patent modifies the chemical composition parameters of the perfluorinated polymer by incorporating specific comonomers (such as perfluoromethylvinylether, perfluoropropylvinylether, or perfluorocyclobutene) in controlled amounts (1-20 mol%). This compositional parameter change enables the material to achieve adequate melt flow at lower temperatures (below 200°C) without the severe thermal degradation that occurs at 200-450°C, thus reducing harmful chemical release while maintaining processability
Solution Approach 2:
The patent creates a composite polymer structure by combining perfluorinated vinylene units with specific comonomer units in a block copolymer architecture. This composite material approach integrates the thermal stability and chemical resistance of perfluorinated polymers with the enhanced processability provided by the comonomer segments, enabling lower temperature processing without sacrificing material performance or generating harmful byproducts
2Manufacturing precision
If perfluorinated polymers are processed at high temperatures to ensure proper deposition and fusion, then the part quality and layer adhesion are improved, but corrosion of metal components and chemical attack on other materials occurs
Solution Approach 1:
The patent changes the processing temperature parameter from the conventional 200-450°C range to a lower range (below 200°C) by modifying the polymer composition. This parameter change prevents the thermal and chemical degradation that causes corrosion and material attack, while the compositional modifications ensure that layer adhesion and deposition quality are maintained through improved melt flow characteristics at the lower processing temperature
Solution Approach 2:
The patent converts the potential harm of poor layer adhesion (which would result from lower processing temperatures) into a benefit by incorporating specific comonomer units that enhance melt flow and rheological properties. This allows the use of lower temperatures that prevent corrosion and chemical attack while simultaneously ensuring proper layer fusion and part quality through the improved flow characteristics of the modified polymer
3Ease of operation
If perfluorinated polymers are processed at high temperatures to achieve adequate flow, then the material can be extruded and deposited, but polymer discoloration and degradation occur
Solution Approach 1:
The patent modifies the polymer composition parameters by incorporating specific comonomers in controlled amounts, which changes the thermal and rheological properties of the material. This compositional parameter change enables extrusion and deposition to be performed at lower temperatures (below 200°C) where the polymer remains stable and does not undergo discoloration or degradation, while still achieving adequate flow for proper extrusion and deposition
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The perfluorinated thermoplastic elastomers provide enhanced throughput, accurate part design control, reduced fume emission, and outstanding chemical resistance, enabling efficient and sustainable 3D printing with improved processing performance.
Implementation Method 1
thanks to their surprising ability to possess better processability (notably more significant shear thinning at processability temperature) than corresponding perfluorinated thermoplasts
Implementation Method 2
The extruded part material fuses to previously deposited part material, and solidifies upon a drop in temperature
Data Source
AI summary
The invention pertains to certain perfluorinated thermoplastic elastomers suitable for being processed through additive manufacturing techniques, thanks to their surprising ability to possess better processability (notably more significant shear thinning at processability temperature) than corresponding perfluorinated thermoplasts, which possess similar product profile and hence performances, offering hence advantages in throughput and part design accurate control, containment of degradation, reduction of fumes, and yet delivering parts with outstanding chemical resistance.