Synthesis and characterization of hyperbranched poly(ether sulfone)imides and MWCNTs-COOH/NH2 Nanocomposites

摘要

A new triamine 1,3,5-tris{4 '-[4 ''-(4 '''-aminophenoxy) phenylsulfonyl]phenoxy} benzene (TAPPSPB) was synthesized and successfully polymerized into hyperbranched polyimides (HBPIs) with commercially available dianhydrides BTDA and PMDA by A(2)+B-3 method. HBPI-PMDA-AMT2/MWCNT nanocomposites were prepared by the reaction of TAPPSPB with PMDA and amino functionalized MWCNT by the conventional two step method by varying the percentage of MWCNT (1, 3, 5, and 7 wt%).The structure of the amine and the resulting hyperbranched polyimides were characterized by FT-IR, H-1, and C-13-NMR analysis. The T-g and T-5% temperature of the HBPIs and nanocomposites were in the range of 229-266 degrees C and 430-493 degrees C, respectively. The results from DSC and TGA show that the T-g and the thermal stability of the HBPI-PMDA-AMT2/MWCNT nanocomposites are higher than that of pristine HBPIs. The dielectric constant (in the range of 3.05-8.54 at 1 MHz) and dielectric loss (in the range of and 0.64-0.87 at 1 MHz) increased with an increase of MWCNTs-COOH/NH2. SEM studies revealed that the MWCNT are evenly dispersed throughout the polymer matrix in the nanocomposites. X-ray diffraction studies shows that the synthesized HBPIs and nanocomposites are amorphous in nature. POLYM. COMPOS., 40:600-614, 2019. (c) 2018 Society of Plastics Engineers