What Reacts with What in Bisphenol A Polycarbonate/Silicon Rubber/Bisphenol A Bis(diphenyl phosphate) during Pyrolysis and Fire Behavior?

被引:50
作者
Wawrzyn, Eliza [1 ]
Schartel, Bernhard [1 ]
Seefeldt, Henrik [1 ]
Karrasch, Andrea [2 ]
Jaeger, Christian [2 ]
机构
[1] BAM Fed Inst Mat Res & Testing, D-12205 Berlin, Germany
[2] BAM Fed Inst Mat Res & Testing, D-12489 Berlin, Germany
关键词
FLAME RETARDANCY MECHANISMS; PC/SIR/BDP/ZINC BORATE PC/SIR/BDP/ZNB; SOLID-STATE NMR; THERMAL-DEGRADATION; ACRYLATE RUBBER/BISPHENOL; METHYL-METHACRYLATE; BUTYL ACRYLATE; CALORIMETER; COPOLYMERS; COMBUSTION;
D O I
10.1021/ie201908s
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The pyrolysis and flame retardancy of a bisphenol A polycarbonate/silicon rubber/bisphenol A bis(diphenyl phosphate) (PC/SiR/BDP) blend were investigated and compared to those of PC/BDP and PC/SiR. The impact modifier SiR consists mainly of poly(dimethylsiloxane) (PDMS > 80 wt %). The pyrolysis of PC/SiR/BDP was studied by thermogravimetry (TG), TG FTIR to analyze the evolved gases, and a Linkam hot stage cell within FTIR as well as Si-29 NMR and P-31 NMR to analyze the solid residue. The fire performance was determined by PCFC, LOT, UL 94, and a cone calorimeter under different external irradiations. The fire residues were studied by using ATR-FTIR as well as the additional binary systems PC + PDMS, PC + BDP, and BDP + PDMS, focusing on the specific chemical interactions. The decomposition pathways are revealed, focusing on the competing interaction between the components. Fire retardancy in PC/SiR/BDP is caused by both flame inhibition in the gas phase and inorganic-carbonaceous residue formation in the condensed phase. The PC/SiR/BDP does not work as well superimposing the PC/SiR and PC/BDP performances. PDMS reacts with PC and BDP, decreasing BDP's mode of action. Nevertheless, the flammability (LOI > 37%, UL 94 V-0) of PC/SiR/BDP equals the high level of PC/BDP. Indeed, SiR in PC/SiR/BDP is underlined as a promising impact modifier in flame-retarded PC/impact modifier blends as an alternative to highly flammable impact modifiers such as acrylonitrile butadiene styrene (ABS), taking into account that the chosen SiR leads to PC blends with a similar mechanical performance.
引用
收藏
页码:1244 / 1255
页数:12
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