Abstract
Synergistic effect between α-zirconium phosphate (α-ZrP) and ammonium sulfamate (AS) for enhanced flame retardant properties of Polyamide 6 (PA6) was investigated by using oxygen index instrument, cone calorimeter, thermogravimetric analyzer (TGA), Instron universal test machine and scanning electron microscopy (SEM). PA6/AS/α-ZrP ternary hybrid materials with various contents of α-ZrP and AS were fabricated by melt-mixing method. The result from flammability indicated that the Limiting oxygen index (LOI) and Underwriters Laboratories-94 (UL-94) rating of PA6/AS/α-ZrP were significantly accelerated under the coordinating function of α-ZrP and AS. Moreover, the thermal stability for PA6/AS/α-ZrP studied by TGA also demonstrated this synergistic effect between α-ZrP and AS on the heat resistance. The effects of the usage amount of α-ZrP and AS on mechanical properties were analyzed by using uniaxial tensile test. It was found that the addition of AS provided negative effects on the tensile strength of PA6/AS/α-ZrP, however, the adverse trends that mentioned above could be overcome by using the well dispersed α-ZrP.
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