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Controlling material attributes for different application requirements




Excursion into PEEK?s crystallization behavior

Some classes of polymeric materials exhibit semi-crystalline attributes at the molecular and microstructural levels. In such cases there is a co-existence of the crystalline phase and the amorphous phase in the material. PEEK (Polyetheretherketone); a high performance / high temperature thermoplastic polymer of immense industrial importance, shows such semi-crystalline attributes. The crystalline domain is characterized by ordered arrangements of molecules while all other domains are disordered. Semi-crystalline polymers like PEEK are resiliently solid at temperatures well above their glass transition temperature Tg, only softening or showing rubbery behavior after it has absorbed a certain amount of heat below the melting temperature Tm. At Tm the crystalline structure undergoes a break-down allowing for an actual flow of the material.

Consider for a moment the reverse process where the fully melted PEEK material is cooling to a solid state. At temperatures Tt where Tg





Posted by on 29. March 2018. Filed under Electronics & Semiconductors. You can follow any responses to this entry through the RSS 2.0. You can leave a response or trackback to this entry

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