▎ 摘　　要

In this study, a new diamine N-[2-(1H-indol-3-yl)ethyl]-3,5-diaminobenzamide (IEDAB) was synthesized using tryptamine as starting material and characterized by FT-IR, H-1-NMR, C-13-NMR, and mass spectroscopy. Then, it was polymerized with 3,3',4,4'-benzophenone tetracarboxylic dianhydride (BTDA) via thermal imidization to produce polyimide (PI). A series PI/GO nanocomposite films were prepared by incorporating different ratios (1, 3, and 5 wt%) of synthesized GO by solution casting method. The synthesized PI was confirmed by Ubbelohde viscometer and FT-IR spectroscopy. SEM and Raman spectroscopy showed that GO was well dispersed in the PI matrix. XRD patterns indicated the PI and PI/GO nanocomposite films were highly amorphous in nature. The synthesized PI and their nanocomposites show high thermal stability as their T-10% weight loss are in the range of 498 to 563 degrees C with 30.6 to 40% of char yield and the glass transition temperatures (T-g s) are in the range of 188 to 262 degrees C. The limited oxygen index (LOI) values increased from 31.4% to 56.0% with increases of 5% GO content in the PI/GO nanocomposite. They have high dielectric constant in the range of 2.6 to 5.1 at 1 MHz and also good mechanical properties with tensile strength of 81 to 116 MPa, elongation at break 5 to 9%. POLYM. ENG. SCI., 2017. (c) 2017 Society of Plastics Engineers