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Anionic polymerization of lactams: A comparative study on various methods of measuring the conversion of ε-caprolactam to polyamide 6

Authors

  • Cai-Liang Zhang,

    1. State Key Laboratory of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
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  • Lian-Fang Feng,

    1. State Key Laboratory of Polymer Reaction Engineering, College of Materials Science and Chemical Engineering, Zhejiang University, Hangzhou 310027, China
    2. Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, 1 rue Grandville BP 20451, 54001 Nancy, France
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  • Guo-Hua Hu

    Corresponding author
    1. Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, 1 rue Grandville BP 20451, 54001 Nancy, France
    2. Institut Universitaire de France, Maison des Universités, 103 Boulevard Saint-Michel, 75005 Paris, France
    • Laboratory of Chemical Engineering Sciences, CNRS-ENSIC-INPL, 1 rue Grandville BP 20451, 54001 Nancy, France
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Abstract

Anionic ring-opening polymerization of lactams leads to the formation of poly(lactams) or polyamides. This work aimed at comparing the performance of four methods for measuring the conversion of ε-caprolactam (CL) to polyamide 6. The latter was either a homopolymer (PA6) or grafts onto polystyrene (PS-g-PA6 graft copolymer). Those four methods were mass balance based on solvent extraction (methanol, water, THF, or acetone), mass balance based on vacuum drying at 140°C, thermogravimetric analysis (TGA), and elemental analysis based on nitrogen. The mass balances based on methanol extraction and vacuum drying at 140°C and TGA were all suitable for measuring the conversion of CL, whether the resulting polymer was the PA6 or PS-g-PA6. The mass balance based on water extraction was good for the PA6 and not good for the PS-g-PA6. The elemental analysis based on nitrogen was not suitable for the PA6 nor for the PS-g-PA6. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1972–1981, 2006

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