What question did this study set out to answer?

This research aims to improve the polymerization process of ε-caprolactam to produce polyamide 6 for fiber production.

May 3, 2026

Steadily Controllable Anionic Ring-Opening Polymerization of ε-Caprolactam at High Temperature with a Low Mg-Initiator Dosage To Produce Polyamide 6 for Direct Melt Spinning.

JZJiahui ZhangShandong University LCLong ChenDonghua University JSJunfen Sun

Key Points

This research aims to improve the polymerization process of ε-caprolactam to produce polyamide 6 for fiber production.
Polymerization conducted at high temperature (220 °C) with low Mg-initiator dosage
Achieved high conversion rates (around 95%)
Monitored residual cyclic dimer levels.
Residual cyclic dimer <0.01 wt % indicating high purity
Demonstrated efficiency and greener alternative to traditional methods
Produced polyamide 6 suitable for direct melt spinning.

Abstract

(220 °C), simultaneously maintaining high conversion (ca. 95%) and a quasi-living character. The cyclic dimer residual was restricted to an unprecedented level (<0.01 wt %). The proposed simple system is more efficient and greener than the traditional HP and AROP techniques, offering a promising approach for producing PA6 fibers via direct melt spinning.

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