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Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 11 (polyundecaneamide)

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Summary

The effect of prolonged annealing at a low super-cooling on the thermal properties and crystalline structure of nylon 11 has been investigated. Annealed nylon 11 formed the lamellar spherulites of the alpha-crystalline modification. Thickness of the lamellae increased with time of annealing from 50 to 165 Å for the samples annealed for 20 and 2000 hours respectively. Corresponding values of the melting temperature and the heat of melting increased from 190 °C and 10 cal/g to 211 °C and 20 cal/g.

The extrapolated heat of melting of the crystalline phase of nylon 11 is 47 cal/g.

Zusammenfassung

Untersucht wurden die thermischen Eigenschaften und kristallinen Strukturen des 11-Polyamid nach langfristiger Temperung mit Temperaturen nahe dem Schmelzpunkt.

Getempertes 11-Polyamid bildete lamellenartige Sphärolithe und kristallisiert in alpha-Modifikation.

Die Dicke der Lamellen vergrößert sich mit der Temperungszeit von 50 Å bei einer Temperungszeit von 20 Stdn. bis auf 165 Å bei einer Zeit von 2000 Stdn.

Schmelzpunkt und Schmelzwärme dieser getemperten Proben erhöhen sich entsprechend von 190 °C und 10 cal/g auf 211 °C und 20 cal/g.

Die extrapolierte Schmelzwärme der kristallinen Phase von 11-Polyamid beträgt 47 cal/g.

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With 8 figures

Presented in part at the 8th Europhysics Conference on Macromolecular Physics, Bristol, 1978.

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Gogolewski, S. Effect of annealing on thermal properties and crystalline structure of polyamides. Nylon 11 (polyundecaneamide). Colloid & Polymer Sci 257, 811–819 (1979). https://doi.org/10.1007/BF01383352

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  • DOI: https://doi.org/10.1007/BF01383352

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