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- W1592159160 abstract "Synopsis Aromatic nitriles may be trimerized at moderate temperature and pressure with p-toluenesulfonic acid as catalyst. Studies were conducted to establish the effect of the reaction temperature, pressure, time, and catalyst concentration on yield of the trimerized product. Trimerization studies were also conducted to establish the effect of substituting electron donating or withdrawing groups on benzonitrile. Preliminary results of using the catalytic trimerization approach to prepare s-triazine cross-linked polyimide/graphite fiber composites are presented. Introduction High temperature resin/fiber composites have the potential of meeting the performance requirements for many advanced aerospace structures. The composites need to exhibit retention of mechanical properties during continuous use at 316°C (600°F) or above (1). Among the high temperature resins, polyamides occupy a preeminent position. Aromatic polyimides (PI's) exhibit thermal stability in excess of 500°C (932°F) as determined by thermal gravimetric analysis (2). However, processing difficulties have limited their use as matrices in resin/fiber composites. Various" @default.
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- W1592159160 date "1974-06-01" @default.
- W1592159160 modified "2023-09-26" @default.
- W1592159160 title "Catalytic Trimerization of Aromatic Nitriles for Synthesis of Polyimide Matrix Resins" @default.
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- W1592159160 doi "https://doi.org/10.1021/bk-1974-0004.ch011" @default.
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