Functionalization of MWNTs and its Influence on Thermal Performance of Modified Diphenyl Ether Polyimide Films

• Published in: Materials science forum Vol. 993; pp. 654 - 661
• Main Authors: Zhang, Xiao Chen, Chen, Ming Yue, Jiang, Hai Jian, Su, Gui Ming, Ma, Yu Liang, Song, Mei Hui, Fang, Xue
• Format: Journal Article
• Language: English
• Published: Pfaffikon Trans Tech Publications Ltd 01.05.2020
• Subjects: Dehydration; Dianhydrides; Differential scanning calorimetry; Liquid chromatography; Molecular weight distribution; Oxidation; Polyimide resins; Thermal decomposition; Thermodynamic properties; Thermogravimetric analysis; Polyimide; Thermal Performance; Functionalization; Films; MWNTs
• ISSN: 0255-5476; 1662-9752; 1662-9752
• DOI: 10.4028/www.scientific.net/MSF.993.654

In this paper, we treated MWNTs by Fendon oxidation method and mixed acid method, finding the factors of functionalized effect affecting MWNTs. And added MWNTs treated to PI matrix for the study of the impact of MWNTs treated on thermal properties of the films. We using 3,3/,4,4/-diphenyl ether tetraacid dianhydride (ODPA) and 4,4'-diamino diphenyl ether (ODA) as raw material, mixing functional MWNTs and monomer by situ polymerization, then MWNTs / PAA hybrid glue was prepared. The molecular weight and distribution of the polyamic acid were measured by gel permeation chromatography (GPC), and the effects of different addition amounts on the product were examined. The PI/MWNTs films were prepared using an automatic film applicator, and finally the PI films were obtained by thermal imidization. The thermal behavior of the imidization process of the product was determined by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The results showed that the PAA film has thermodynamic behavior at 150 ° C and 280 ° C approximately, which could be regarded as the kinetic interruption temperature of the imidization reaction. The dehydration cyclization reaction mainly occured in these two temperature ranges, moreover, the addition of MWNTs had no significant effect on the thermal decomposition temperature of the material which doping amount that does not affect the mechanical strength.