Study on the Influence of Crystal Structures on the Performance of Low-Melting Polyamide 6

Abstract

In this article, the effects of crystal structures on polyamide 6(PA6) and low melting point polyamide 6(LPA6) were studied. After heat treatment, the crystal structures of PA6 and LPA6 changed. With the increase of annealed temperature, the crystallinity of PA6 and LPA6 increased and a γ-α crystal transformation occurred, the tensile and flexural properties of the both polyamide 6 increased, especially for LPA6. The Vicat softening temperature of LPA6 increased significantly while the Vicat softening temperature of PA6 decreased slightly.

Keywords:

• Crystal structures
• Crystallinity
• Low melting point polyamide 6
• Performance

ACKNOWLEDGMENTS

The authors acknowledge the Contract grant sponsor: the National Natural Science Foundation of China, Contract grant number: 50863001.

Notes

*CI was calculated by the equation: , where ΔH_o represents heat of fusion for PA6, 100% crystalline, average value of α-crystal and γ-crystal, 240 J/g. ω_PA6 represents the mass fraction of PA6 in LPA6, 94%.