摘要
采用双螺杆挤出机挤出造粒制备了苯基双酚 A 二磷酸酯(BDP)阻燃的聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯(ABS)、PC/ABS/有机蒙脱土(OMMT)和 PC/ABS/有机改性纳米二氧化硅(SiO_2)_3种复合材料,采用热重分析探讨了 PC/ABS/BDP、PC/ABS/BDP/OMMT 和 PC/ABS/BDP/SiO_2复合材料的热降解动力学行为,以此分析其阻燃性能与热降解行为的关系。结果表明,加入纳米材料后,在质量损失8%以前,PC/ABS/BDP/OMMT 和 PC/ABS/BDP/SiO_2纳米复合材料的活化能均低于 PC/ABS/BDP 的活化能,但质量损失8%以后,PC/ABS/BDP/OMMT 和PC/ABS/BDP/SiO_2复合材料的活化能均高于阻燃 PC/ABS。在质量损失5%~75%范围内,PC/ABS/BDP/OMMT和 PC/ABS/BDP/SiO_2平均活化能分别为139.39 kJ/mol 和144.17 kJ/mol,均高于 PC/ABS/BDP 的平均活化能(104.87 kJ/mol).说明添加纳米材料后,由于 BDP 与 OMMT 或 SiO_2的协同阻燃作用,降低了材料的热降解速率,增大了材料的热稳定性,这与氧指数测试、UL94 V 阻燃性能及热重分析得出的结论一致。
Composites of polycarbonate/acrylonitrile-butadiene-styrene copolymer (PC/ABS), PC/ABS/ organic montmorillonite (OMMT), and PC/ABS/organic-modified nano-SiO2(SiO2) flame retarded by bisphenol A all(phosphate phenyl ester)(BDP) were prepared via extrusion and granulation using a twinscrew extruder. By means of TG, their thermal decomposition kinetic behaviors in nitrogen atmosphere were studied. Before 8 % mass loss, the activation energy of the PC/ABS/BDP/OMMT and PC/ABS/ BDP/SiO2 nancomposites was lower than that of PC/ABS/BDP. However the opposite was observed after 8 % mass loss. The average activation energy of PC/ABS/BDP/OMMT and PC/ABS/BDP/SiO2 were 139.39 kJ/mol and 144.17 kJ/mol in 5 % -75 % mass loss, respectively, all greater than that of PC/ABS/BDP(104.87 kJ/mol). It was found that with OMMT or SiO2 added, the thermal decomposition speed of PC/ABS/BDP decreased and the thermal stability increased, as confirmed by the measure- ments of TG, limiting oxygen index, and UL94 V flame retardancy.
出处
《中国塑料》
CAS
CSCD
北大核心
2008年第5期25-29,共5页
China Plastics
基金
西华大学重点科研项目(Z0723303)
关键词
聚碳酸酯
丙烯腈-丁二烯-苯乙烯共聚物
苯基双酚A二磷酸酯
阻燃
热降解动力学
polycarbonate
acrylonitrile-butadiene-styrene copolymer
bisphenol A di( phosphate phenyl ester)
retardancy
thermal degradation kinetics