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Preparation and characterization of flame-retarded polyamide 66 with melamine cyanurate by in situ polymerization

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Abstract

In order to improve the flame retardancy and expand the applications of polyamide 66 (PA66), the flame-retarded PA66 (FRPA66) was synthesized by in situ polymerization using nylon salt in the presence of melamine cyanurate (MCA) in an autoclave. The structure and properties of FRPA66 were investigated by Fourier transform infrared spectra (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), thermogravimetric analysis (TGA), tensile test, scanning electron microscopy (SEM), vertical burning test (UL94), and limiting oxygen index (LOI) test. Experimental results indicated that MCA particles had heterogeneous nucleation effect which contributed the crystallization of PA66 chains at higher temperature and had a higher crystallization degree. The thermal stability and mechanical properties of FRPA66 declined compared to PA66, but the flame retardant properties improved with the loading of MCA. The FRPA66 loaded with 6 wt% of additives can achieve a UL94 V-0 rating with a LOI value of 31.5%. It also can be inferred that both the mechanical property and flame retardancy of FRPA66 prepared by in situ polymerization are better than that of FRPA66 prepared by melt blending at the same dosage.

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, 201620, P. R. China

    Yuanyuan Li, Ke Liu & Ru Xiao

Authors
  1. Yuanyuan Li
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  2. Ke Liu
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  3. Ru Xiao
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Corresponding author

Correspondence to Ru Xiao.

Additional information

Acknowledgments: The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (No.21374015), the National Key Research and Development Program of China (No.2017YFB0309003) and the Program of Introducing Talents of Discipline to Universities (No.111-2-04).

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Li, Y., Liu, K. & Xiao, R. Preparation and characterization of flame-retarded polyamide 66 with melamine cyanurate by in situ polymerization. Macromol. Res. 25, 779–785 (2017). https://doi.org/10.1007/s13233-017-5081-1

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  • DOI: https://doi.org/10.1007/s13233-017-5081-1

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