| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Influence of Shear on Crystallization Kinetics in Poly (Ether Ketone Ketone) Nanocomposites |
| Author(s) |
Nicholas R. Enos, Jeffrey Wiggins |
| On-Site Speaker (Planned) |
Nicholas R. Enos |
| Abstract Scope |
Interest in thermoplastic composites for aerospace applications has been driven by the need for high-volume manufacturing of materials that display excellent mechanical, thermal, and solvent resistive properties. Poly (ether ketone ketone) (PEKK) is a semi-crystalline polymer with high potential as a thermoplastic polymer matrix for aerospace composites and relies on the crystalline portions of the matrix for its improved thermomechanical properties. Common thermoplastic melt processing methods can expose thermoplastic materials to a high range of shear conditions which can influence both crystallization rate and crystalline morphology. Carbonaceous additives such as carbon fibers or nanomaterials can also influence the crystallization kinetics and morphology of semi-crystalline polymers through changes in nucleation behavior and local diffusion rates. Herein, crystallization behavior in PEKK and PEKK/Carbon Nanotube (CNT) Composites prepared via high-temperature compounding is studied at various shear conditions via parallel plate rheology. Shear rates as low as 5 s-1 were found to significantly accelerate crystallization rate in neat PEKK and correlates to the modelled relaxation time of the material. The presence of CNTs also led to an increased relaxation time and accelerated crystallization in both quiescent and sheared conditions. This work provides greater insight into crystallization behavior of PEKK and its nanocomposites at conditions relevant to real world melt processes. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |