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Synthesis and characterization of new soluble and thermostable polyimides via novel diisocyanates

✍ Scribed by Barikani, Mehdi; Yeganeh, Hamid; Ataei, Shahram Mehdipour

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
86 KB
Volume
48
Category
Article
ISSN
0959-8103

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✦ Synopsis

A facile synthesis of two novel diisocyanates containing methylene groups and preformed imide structure is described. Furthermore, six thermally stable and soluble polyimides were synthesized by polycondensation of these two diisocyanates with pyromellitic dianhydride (PMDA), 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) and hexaΒ―uoroisopropylidene-2,2-bis-(phthalic anhydride) (6FDA) in N,N-dimethyl acetamide. All monomers and polymers were characterized by conventional methods and their physical properties such as solution viscosity, solubility properties, thermal stability and thermal behaviour were studied.

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