多壁碳纳米管/聚酰亚胺复合薄膜的制备与性能研究

Preparation and Properties of Multi-walled Carbon Nanotubes/Polyimide Composite Films

采用两种方法(混酸法和酰氯化法)处理多壁碳纳米管制得羧酸化多壁碳纳米管(MWNTs-COOH)和酰氯化多壁碳纳米管(MWNTs-COCl),并以4,4'-二氨基二苯醚(ODA)和均苯四甲酸二酐(PMDA)为原料,原位聚合制备多壁碳纳米管/聚酰亚胺复合薄膜。通过偏光显微镜(PLM)、傅里叶红外光谱测试仪(FT-IR)、热重分析仪(TGA)以及万能拉伸试验机对复合薄膜进行表征及测试。结果表明:随着多壁碳纳米管含量的增加,复合薄膜的拉伸强度呈现先增加后减小的趋势,酰氯化多壁碳纳米管/聚酰亚胺(MWNTsCOCl/PI)复合薄膜的拉伸强度较羧酸化多壁碳纳米管/聚酰亚胺(MWNTs-COOH/PI)复合薄膜提高了13.3%,导电性提高约103倍;且MWNTs-COCl含量在3%时,MWNTs-COCl/PI复合薄膜的综合性能达到最佳。

In this paper,carboxylated multi-walled carbon nanotubes(MWNTs-COOH)and acyl chloride-based multi-walled carbon nanotubes(MWNTs-COCl)were prepared by treating multi-walled carbon nanotubes by two methods(mixed acid method and acyl chloride method).4,4'-diaminodiphenyl ether(ODA)and pyromellitic dianhydride(PMDA)were used as raw materials to prepare multi-wall carbon nanotubes/polyimide composite films by in-situ polymerization.The composite films were characterized and tested by polarizing microscope(PLM),fourier transform infrared spectroscopy(FT-IR),thermogravimetric analyzer(TGA)and universal tensile tester.The results showed that with the increase of the content of multi-walled carbon nanotubes,the tensile strength of the composite films increased first and then decreased.The tensile strength of acyl chloride multi-walled carbon nanotubes/polyimide(MWNTs-COCl/PI)composite films was increased by 13.3%,compared with carboxylated multi-wall carbon nanotubes/polyimide(MWNTs-COOH/PI)composite films.Conductivity of MWNTs-COCl/PI composite films is about 10 3 times stronger than MWNTs-COOH/PI composite films.When the MWNTs-COCl content is 3%,the combination property of MWNTs-COCl/PI composite films is the best.