Synthesis and characterization of flexible/stretchable polyimide having long/bulky aryl pendent group and polyimide/silicon dioxide nanocomposites.

Abstract

A new diamine monomer having ether and azomethine linkages in the long pendent group was synthesized. New polyimide was prepared by reacting the new diamine with BTDA and nanocomposites were prepared with silicon dioxide as nanofiller. SEM analysis shows a uniform distribution of the nanopowder in the polyimide matrix. TGA shows that the polyimide and nanocomposites have good thermal stability with the T10% values varying between 440 and 458°C. DSC analysis shows Tg values between 210 and 230°C. The neat polyimide shows high elongation at break and stretchability (260%) but low tensile strength. The nanocomposites of polyimide show lower elongation at break but have improved tensile strength. The chemically imidised polyimide shows good solubility in solvents like N, N‐dimethyl formamide, N, N‐dimethyl acetamide, and N‐methyl 2‐pyrrollidone. POLYM. COMPOS., 40:832–843, 2019. © 2018 Society of Plastics Engineers

The effects of long and bulky aromatic pendent groups with flexible linkages on the thermal, mechanical and electrical properties of the polyimides and their nanocomposites with functionalized silica

“…Here, the elongation is less compared to that in our previously published work in which one long aromatic pendent group is present. 27 In 2007 Wang et al 8 reported that poly etherimides with multiple alkyl side chains (number of CH 2 groups in each chain varies from 5 to 18) showed very high elongation at break (200–470%). Tensile strength of those polyimides was found to be low.…”

“…In one of our recently published work, the polyimide having single pendent groups exhibits high elongation at break of 260%. 27 The effect of side groups in the polyimide chain backbone on thermal, mechanical and electrical properties were investigated in detail by Meise et al 28 and Deng et al 29 …”