Why does Nylon, like Polyamide 66, have higher crystallization temperature after processing? We have tested the DSC (cooling rate: 20℃/min) of the Neat Polyamide 66 chips (without additives), the DSC shows the crystallization temperature is 208℃, but after extrusion or injection molding, the DSC results of the extrudates or injection molding bars show the crystallization temperature up to 230℃. Is this because of the reduction of the molecular weight after processing? But we have test the relative viscosity before and after processing, and show no significant difference.
Why does Nylon have higher crystallization temperature after processing?
How does the exothermic peak at the glass transition temperature vary? How does this peak vary with the number of thermal cycles? Interpretation of this peak is not possible with ATD measurements alone. Recrystallization is endothermic, not exothermic. It is the consequence of the exothermic transformation of internal energy, which can be verified by microcalorimetry and polarization measurements. Check out this trail, as it is a key to understanding properties under stress.
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