TY - JOUR
AU1 - Mishra, Ajit Kumar
AU2 - Schultz, Jerold M.
AB - Dynamic, in situ wide angle X‐ray scattering (WAXS) studies of the melt crystallization of injection‐molded poly(ether ether ketone) (PEEK) have been carried out using an X‐ray diffractometer and a position‐sensitive detector. A test cell has been fabricated to fit inside the diffractometer and yet work as a complete injection molding apparatus. The rate of crystallization has been shown to increase with decreasing crystallization temperature and/or increasing flow rate in the mold. The crystallization rate decreases dramatically with increase in melt soak time at 400°C. The crystallinity index, which affects the stiffness, toughness, and fracture behavior of PEEK, has been measured under various processing conditions, by wide angle X‐ray scattering, so as to optimize the process parameters: molding time, mold temperature, melt temperature, soak time at melt temperature, and flow rate. It has been shown that the crystallinity and hence the elastic modulus increase with increase in crystallization temperature and/or flow rate. Chain orientation has been shown to be absent in the bulk of the injection‐molded specimens under normal molding conditions.
TI - Effect of flow rate and temperature on crystallization kinetics, crystallinity index, and elastic modulus of PEEK
JF - Journal of Applied Polymer Science
DO - 10.1002/app.1989.070380406
DA - 1989-08-20
UR - https://www.deepdyve.com/lp/wiley/effect-of-flow-rate-and-temperature-on-crystallization-kinetics-9C3qRNU8wk
SP - 655
EP - 666
VL - 38
IS - 4
DP - DeepDyve
ER -