Effects of alpha-ZrP on Crystallinity and Flame-Retardant Behaviors of PA6/MCA Composites

摘要

Novel flame-retardant Polyamide6/Melamine cyanurate-alpha-zirconiumphosphate (PA6/MCA-alpha-ZrP) compositeswere prepared via the incorporation of the modified MCA (MCA-alpha-ZrP) into PA6. MCA-alpha-ZrP were synthesized through the self-assembly of alpha-ZrP, Melamine (ME), and cyanuric acid (CA) molecules. The results of differential scanning calorimetry (DSC) and X-ray diffraction (XRD) showed that the incorporation of enough alpha-ZrP (30wt% MCA) caused the increased crystallinity of PA6 and tended to form gamma phase. The thermogravimetric analysis (TGA) and heat distortion temperature (HDT) test illustrated that the alpha-ZrP could increase the residue and HDT values of PA6/MCA and showed a synergistic effect withMCA. The combination ofMCA and alpha-ZrP caused the enhancement of vertical burning test (UL-94) rating. Cone calorimeter test (CCT) gave clear evidences that PA6/MCA-10 alpha-ZrP composites with low heat release rate (HRR), low total heat release (THR), and high amounts of char residues after combustion compared with PA6/MCA and PA6/MCA-30 alpha-ZrP. What ismore, excellentmechanical properties were kept even though MCA and alpha-ZrP were dispersed not as good as expected.