SynopsisCrosslinking of 4,4'(bismaleimido)diphenyl ether (BM) was investigated in presence of bis(maminophenyl) methylphosphine oxide (BAP), tris(m-aminopheny1)phosphine oxide (TAP), diaminodiphenyl ether (E) and 3,3-bis(p-aminophenyl)phthalide (AP). These crosslinked resins were examined for thermal stability by thermogravimetric analysis. A slight decrease in initial decomposition temperature, the temperature of maximum rate of weight loss, was observed, though the char yield in nitrogen atmosphere a t 8OOOC did not change appreciably. Glass-cloth-reinforced laminates were fabricated from BM and amine mixtures. An improvement in mechanical properties was observed in the presence of phosphorus-containing di-and triamines.
This article describes the synthesis of N,N′‐bis(3,3′‐maleimidophenyl) sulfone (S) and its Michael addition products with (4,4′‐diaminodiphenyl) methane (S‐M), 4,4′‐diaminodiphenyl ether (S‐E), (3,3′‐diaminodiphenyl) sulfone (S‐DDSm), (4,4′‐diaminodiphenyl) sulfone (S‐DDSp), (3,3′,3″‐tris aminophenyl) phosphine oxide (S‐TAP), and 9,9‐bis(p‐aminophenyl) fluorene (S‐B). Curing behavior of these bisimides was investigated by differential scanning calorimetry. Activation energy of curing reaction was determined by using isothermal and multiple heating rate method. Thermal stability of bisimides was evaluated by thermogravimetric analysis. Better char yields were obtained in S‐TAP resins.
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