Effect of ABS Phase Composition on Mechanical Properties and Flame Retardancy of PC/ABS Alloy

Flame retardant polycarbonate(PC)/acrylonitrile-butadiene-styrene(ABS)alloys were prepared by melt blending with decabromodiphenyl ethane (DBDPE)/antimony trioxide(Sb2O3) synergistic system as flame retardant and polytetrafluoroethylene (PTFE) as anti-dripping agent. The composition of ABS phase in PC/ABS flame retardant alloy was adjusted by styrene-acrylonitrile copolymer (SAN) and high-rubber ABS (ABS-HRP). The effect of the ratios of SAN to polybutadiene (PB)in ABS phase on the morphology and phase interface of flame retardant alloy was observed by scanning electron microscopy (SEM), and the effects of ABS phase compositions on the mechanical properties and flame retardant properties of flame retardant alloys were studied by impact test, tensile test and flame retardant test. The results show that when the mass ratio of PC and ABS is 70: 30, and the mass ratio of bromine antimony flame retardant is 5 phr, when ABS is replaced by 5 phr SAN, the flame retardant UL 94 V-0 can be achieved, the notched impact strength is increased from 7.6 kJ/m2 to 10.3 kJ/m2, and the tensile strength is increased from 52.3 MPa to 54.5 MPa, a small amount of SAN (< 5 phr) can play a dual role of strengthening and toughening rigid particles; when 15 phr ABS-HRP is used instead of ABS, the alloy can achieve flame retardant UL 94 V-0, and maintain a good balance between toughness (notch impact strength of 29.2 kJ/m2) and rigidity (tensile strength of 44.7 MPa). © 2020, Editorial Board of Polymer Materials Science & Engineering. All right reserved.