摘要
采用硝酸氧化/低温等离子处理两步法,将多壁碳纳米管(MWCNTs)羧基化(MWCNTs-COOH),以改善其在ABS基体中的分散性。通过熔融共混的方法制备不同组分ABS/MWCNTs-COOH复合材料。利用红外、拉曼分析、扫描电镜对改性修饰后MWCNTs结构进行研究;利用扫描电镜、热重分析、极限氧指数、残炭分析、力学性能测试对ABS/MWCNTs-COOH复合材料分散性、热性能、阻燃性能、力学性能进行研究。实验结果表明,MWCNTs羧基化改性后提高了在ABS基体材料中的分散性;当MWCNTs-COOH含量为1%时,复合材料初始分解温度和最大分解温度分别提高了22.69℃和27.90℃,热稳定性提高,同时复合材料力学性能也得到改善,拉伸强度提高了18.3%;极限氧指数和残炭测试表明,MWCNTs-COOH加入提高了复合材料的极限氧指数,MWCNTs-COOH在复合材料燃烧过程中,会在材料表面形成网络状炭层,提高复合材料的阻燃性能。
Multi-walled carbon nanotubes(MWCNTs)were carboxylated(MWCNTs-COOH)by a two-step method of nitric acid oxidation/low temperature plasma treatment to improve their dispersibility in acrylonitrile-butadiene-styrene copolymer(ABS)matrix.ABS/MWCNTs-COOH composites with different compositions were prepared by melt blending.The structure of modified MWCNTs was studied by infrared,Raman analysis and scanning electron microscopy.The dispersibility,thermal properties,flame retardancy and mechanical properties of ABS/MWCNTs-COOH composites were investigated by scanning electron microscopy,thermogravimetric analysis,limiting oxygen index,carbon residue analysis and mechanical properties tests.The results show that the carboxylation of MWCNTs improves the dispersibility in the ABS matrix.When MWCNTs-COOH content is 1%,the initial decomposition temperature of the composite material and the maximum decomposition temperature are increased by 22.69℃and 27.90℃,thermal stability is improved,while the mechanical properties are also improved,the tensile strength increased by 18.3%.According to the limit oxygen index and carbon residue test,the addition of MWCNTs-COOH increases the limiting oxygen index of the composite.MWCNTs-COOH forms a networked carbon layer on the surface of the composite during the combustion of the composite to improve the flame retardancy of the composite.
作者
丁永红
杨景红
郭亮
Ding Yonghong;Yang Jinghong;Guo Liang(School of Material Science &Engineering,Changzhou University,Changzhou 213100,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2019年第3期1-6,共6页
Engineering Plastics Application
关键词
丙烯晴–丁二烯–苯乙烯共聚物
多壁碳纳米管
羧基化
复合材料
阻燃性能
acrylonitrile-butadiene-styrene copolymer
multi-walled carbon nanotube
carboxylation
composite
flame retardant performance
