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- W2083842488 abstract "Two new polyimidosulphides were prepared in 94% yield or higher and with inherent viscosities as high as 1.45 dl g−1 (0.5 g polymer/100 ml dimethyl sulphoxide; 25°C) by the addition of 4,4′-dimercaptodiphenylether or 4,4′-dimercaptobiphenyl to N,N′-bismeleimido-4,4′-diphenylmethane. Formation of soluble species requires a solvent that is or contains a proton source, since crosslinked products results otherwise. The polymers are amorphous thermoplastics with rigid backbones, reflected by their high glass transition temperatures (Tg = 185°–212°C) as well as by their insolubility in all but highly polar media, such as dimethyl sulphoxide of N,N-dimethylformamide. Both polyimidosulphides, when heated under nitrogen or air (thermogravimetric analysis), show no weight loss up to about 350°C, but the polymers degrade catastrophically (apparently via base-catalysed thiol elimination) within minutes at room temperature when dissolved in aprotic solvents containing secondary or tertiary amines." @default.
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- W2083842488 date "1984-06-01" @default.
- W2083842488 modified "2023-10-14" @default.
- W2083842488 title "Polymerization of N,N′-bismaleimido-4,4′-diphenylmethane with arenedithiols. Synthesis of some new polyimidosulphides" @default.
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- W2083842488 doi "https://doi.org/10.1016/0032-3861(84)90017-x" @default.
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