Undrawn and drawn polyamide-6 bristles were annealed in vacuum at different temperatures between 80 and 228°C. It was found that at higher temperatures (above 140 to 160 °C) besides an increase of the crystallinity an additional solid state postcondensation proceeds, leading to a narrower molecular weight distribution. These changes in crystallinity, molecular weight and its distribution result in improved mechanical properties. The influence of annealing on the orientation as well as its relation to the mechanical behaviour are discussed.

Abstract

Gereckte und ungereckte Polyamid-6-Borsten wurden bei verschiedenen Temperaturen zwischen 80 und 228°C im Vakuum getempert. Bei höheren Temperaturen (oberhalb 140 bis 160°C) wurde außer einer Zunahme der Kristallinität auch eine Festkörper-Nachpolykondensation gefunden, die zu einer schmaleren Molekülmassenverteilung führt. Diese Änderungen der Kristallinität, der rel. Molekülmasse und der Molekülmassenverteilung bewirken die Verbesserung der mechanischen Eigenschaften. Der Einfluß des Temperns auf die Orientierung sowie der Zusammenhang zwischen der Orientierung und dem mechanischen Verhalten werden ebenfalls diskutiert.

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Volume33, Issue4

April 1982

Pages 271-275

Influence of thermal treatment, molecular weight and orientation on the mechanical properties of polyamide-6

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Influence of thermal treatment, molecular weight and orientation on the mechanical properties of polyamide-6

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