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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