Reactive extrusion for the synthesis of nylon 12 and maleated low-density polyethylene blends via the anionic ring-opening polymerization of lauryllactam

Authors

  • Libo Du,

    1. Chinese Academy of Sciences Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
    2. Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China
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  • Guisheng Yang

    Corresponding author
    1. Chinese Academy of Sciences Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
    2. Shanghai Genius Advanced Materials Company, Limited, Shanghai 201109, People's Republic of China
    • Chinese Academy of Sciences Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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Abstract

Nylon 12 was successfully synthesized in a twin-screw extruder via the anionic ring-opening polymerization of lauryllactam (LL). Maleated low-density polyethylene (LDPE–MAH) was added to improve the mechanical properties of nylon 12. The in situ blends of nylon 12 and LDPE–MAH were characterized by mechanical testing and scanning electron microscopy. With increasing LDPE–MAH content, the tensile strength and flexural strength decreased, whereas the blend had improved impact strength and achieved supertoughness when the content of LDPE–MAH was 30 wt %. In the in situ formed low-density polyethylene-g-PA12 copolymer, the domain of the LDPE–MAH phase was finely dispersed in the nylon 12 matrix. The good interface between the two phases demonstrated that LDPE–MAH could be used as a macromolecular activator to induce the polymerization of LL. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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