VCL#53 Part 3

Abstract

In this section we use Rheology to characterize the onset of crystallization on cooling under various cooling rates. The rheological mode is a temperature sweep at constant radial frequency in the linear viscoelastic region (small strain). We modify the frequency to change the elastic state of the melt during its cooling at constant cooling rate. We compare the complex viscosity and the G'(T) and G"(T) moduli under these variable conditions of cooling rate and frequency.

These results confirm what what already concluded in part 1 and 2 that the entanglement state, varied by Rheo-Fluidification, correlates with the crystallization behavior, and that liquid-glassification (“Grain Glassification”) occurs simultaneously and competes with crystallization. All measured parameters return to normal when we extensively anneal the samples, presumably resulting in the return to a stable network of entanglement.

Temperature sweeps at constant Frequency. Grain-Field Statistics. Conclusions.

links to downloadable VCL#53 part 3

(85.8 MB; 1h 35 min): inquire @ :Beltzeki@eknetcampus.com