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Polyimides are attractive for high temperature applications as the matrix resins, due to their excellent thermo-oxidative stability and mechanical properties. As composite materials for aerospace applications, they possess certain unique characteristics such as toughness, resistance to temperature and solvents as well as high tensile strength and modulus. A series of novel PMR polyimides based on...
A bis[pyrylium tetrafluoromethanesulfonate (triflate)], i.e. p-bis[4-(2,6-diphenylpyrylium)]benzene ditriflate) (3), has been prepared and polymerized with a series of aromatic diamines. The polymerizations, which were carried out in a dimethylsulfoxide (DMSO)/toluene mixture at 150°C for 3–4h, were significantly faster than previous polymerizations of an analogous bis(pyrylium tetrafluoroborate)...
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