Abstract
AbstractSix new structurally different bismaleimides or bisnadimides based on 2,5‐bis(4‐aminophenyl)‐3,4‐diphenylthiophene (BADT) were synthesized and characterized by infrared (IR) and proton nuclear magnetic resonance (1H‐NMR) spectroscopy. Chain‐extension of several bismaleimides was accomplished by incorporating various imide, amide, and urea groups. The bismaleimide and bisnadimide prepared by reacting BADT with maleic or nadic anhydride, respectively, were soluble in various organic solvents. The monomers were thermally polymerized or by a Michael reaction with certain aromatic diamines. Curing behavior was investigated by differential thermal analysis (DTA). The thermal and thermo‐oxidative stability of polymers was evaluated by dynamic thermogravimetric analysis (TGA) and isothermal gravimetric analysis (IGA). The polymers derived from bismaleimide of BADT as well as from the bismaleimides chain‐extended by imide groups were stable up to 355–392°C in N2 or air and afforded anaerobic char yield 66–74% at 800°C. The polymers obtained by curing the bismaleimide‐diamine adducts showed a relatively lower thermal stability.
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