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W. Tomaszewski, A. Włochowicz



The effect of heating on the supramolecular structure of melt-crystallized PA 6.10. Part II. Crystal structure improvement

and multiple recrystallization model


Polimery 1998, No 6, 365


DOI: dx.doi.org/10.14314/polimery.1998.365


Summary

Changes were studied, caused by heating, in the thermolabile crystal structure of polyamide 6.10 crystallized isothermally from the melt. PA 6.10 specimens were heated for 1 min at temperatures higher than the PA crystallization point. Densimetry, DSC, WAXS and SAXS techniques were used to study how recrystallization affects structural changes. The effect is related to the original degree of perfection of the crystal structure. Multiple recrystallization was found to underlie the process of structural variations. A simplified phenomenological model based on the Hoffman-Weeks relationship developed for the melting of lamellar crystallites was used to explain the effect observed. The model was found to be imperfect and improvement directions are suggested.


Keywords: polyamide 6.10, heating, multiple recrystallization, melting, stability of crystal structure


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