Abstract
A new rigid tetracarboxylic dianhydride, 3,3''',4,4'''-p-quarterphenyltetracarboxylic dianhydride, was synthesized in three steps starting from diethyl 4-bromophthalate. New aromatic polyimides containing a p-quarterphenyl unit were synthesized from this tetracarboxylic dianhydride and various aromatic diamines by the conventional two-step procedure that included ring-opening polyaddition in a polar amide-type solvent and subsequent thermal cyclic dehydration. These polyimides had inherent viscosities of 0.41—0.83 dl g-1, and were insoluble in organic solvents. The glass transition temperatures (Tg) of the polyimides were 220—260°C, and exothermic crystallization was observed on heating above its Tg. Almost all the polyimides underwent melting prior to its decomposition.
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Morikawa, A. Synthesis and Characterization of Novel Aromatic Polyimides from Aromatic Diamine and 3,3''',4,4'''-p-Quarterphenyltetracarboxylic Dianhydride. Polym J 32, 275–279 (2000). https://doi.org/10.1295/polymj.32.275
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DOI: https://doi.org/10.1295/polymj.32.275