Effect of processing conditions on crystallization kinetics during materials extrusion additive manufacturing.

ABSTRACT: Material extrusion additive manufacturing processes force molten polymer through a printer nozzle at high (> 100 s-1) wall shear rates prior to cooling and crystallization. These high shear rates can lead to flow-induced crystallization in common polymer processing techniques, but the magnitude and importance of this effect is unknown for additive manufacturing. A significant barrier to understanding this process is the lack of in situ measurement techniques to quantify crystallinity after polymer filament extrusion. To address this issue, we use a combination of infrared thermography and Raman spectroscopy to measure the temperature and percent crystallinity of extruded polycaprolactone during additive manufacturing. We quantify crystallinity as a function of time for the nozzle temperatu

SUBMITTER: Northcutt LA 

PROVIDER: S-EPMC6459419 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature