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The same polymer with 80% straight and 20% kinked segments will have a melting point of about 360☌, and a crystallization rate similar to PEEK.A while back, one of our readers asked me to suggest a way to fix the grayed out Use Peek to preview the desktop when you move your mouse to the Show desktop button at the end of the taskbar option that appears under Taskbar and Navigation properties. By varying the number of straight and kinked sections, it is possible to control the melting point and crystallization rate.įor example, a PEKK polymer with 60% straight and 40% kinked segments will melt at about 305☌ and be so slow to crystallize that it is often called “pseudo-amorphous”. The second Ketone group is selectively ortho (straight) or para (kinked) substituted. This increases the glass transition temperature (Tg)– where the material first begins to soften– by about 15☌ over PEEK.Ģ. PEKK replaces one of the flexible Ether linkages with a more rigid Ketone group. PEKK and PEEK have very similar chemical structures, except for two key differences.ġ. Hence, these materials are commonly used in the most demanding applications.
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This family of polymers is known for their: PEKK (Poly-Ether-Ketone-Ketone) and PEEK (Poly-Ether-Ether-Ketone) are both part of the PAEK (Poly-Aryl-Ether-Ketone) family of ultra-high performance thermoplastic polymers. The PAEK family of ultra-high performance materials
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They are also often extruding at very high temperatures to partially melt the previous layer in an attempt to make a part with acceptably low warping and decent layer adhesion. To overcome this, many 3D printer manufacturers have taken extreme measures to increase bed adhesion. In conventional processing techniques, this dimension change is easily accounted for and is widely understood. Its crystalline segments are almost completely resistant to further chain diffusion and entanglements. Like most semi-crystalline materials, it undergoes a significant dimensional change (shrinkage) when it crystalizes. PEEK is a highly crystalline material with very fast crystallization kinetics. This results in better dimensional accuracy and layer adhesion for FFF objects. Indeed, amorphous polymers undergo less dimension change when cooling, and the disordered structure allows some diffusion and entanglement between polymer chains in adjacent layers. Semi-crystalline: semi-crystalline polymers contain both disordered, amorphous regions as well as crystalline domains where the chains arrange into ordered patterns.Īlmost all polymers used in FFF fall into the category of amorphous materials as they are far easier to process than semicrystalline materials.The analogy often used is a bowl of cooked spaghetti. Amorphous: amorphous polymers are simply tangled messes of long molecules.Plastic materials can be divided into two categories: Amorphous and semi-crystalline thermoplastics: what’s the difference? However, many of the properties that make it so appealing for these processing techniques make it incredibly difficult to process in FFF (fused filament fabrication).
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The desire to print PEEK is understandable, as it is often the go-to high-performance material for stock shape machining or injection molding. Over the past few years, there has been lots of buzz over 3D printers that can process PEEK (polyetheretherketone), one of the most widely known ultra-high performance polymers.