Unusual crystalline morphology of Poly Aryl Ether Ketones (PAEKs)
Beard, James D.
Evans, Kenneth E.
Royal Society of Chemistry
Copyright © Royal Society of Chemistry 2015
This article is licensed under a Creative Commons Attribution 3.0 Licence.
The crystal structure of Poly Aryl Ether Ketones (PAEKs) fabricated using a range of manufacturing processes has been investigated by high resolution electron microscopy. The study has revealed a hierarchical spherulitic crystal structure, different from the common spherulite morphology with lamellae grown in a radial direction. Results show that spherulites in laser sintered PAEKs are built of granular crystal blocks of 75-145 nm in size self-assembled along the radial direction. The study also showed that the granular crystal blocks are composed of small primary crystals approximately 20-30 nm in size combined together with a secondary structure. The secondary structure was found to be less ordered and was preferentially removed during chemical etching whereas the primary crystals remained intact.
Engineering and Physical Science Research Council (EPSRC)
Vol 6, No 4. pp. 3198-3209