Phosphorus containing nadicimide oligomers: Synthesis and characterization

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:arial;mso-ansi-language:en-us;mso-fareast-language:="" en-us;mso-bidi-language:ar-sa"="">The paper describes the synthesis and characterization of several nadicimide oligomers derived from tris [3-(4-aminobenzamido) phenyl] phosphine oxide (TABP), pyromellitic dianhydride (PMDA)/3,3',4,4'-benzophenone tracarboxylic acid dianhydride (BTDA). Structural characterization of the resins has been done by elemental analysis, IR and ¹H NMR spectroscopy Curing behaviour of these oligomers depends on the structure. Exothermic transitions due to curing have been observed in the temperature range of 250 ± 20 to 295 ± 25°C. Isothermal curing of the resins has been done at 340°C for 1h in air atmosphere. The cured resins are stable up to 300°C and decompose in a single step above this temperature.</span>