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High-pressure synthesis and properties of aliphatic–aromatic polyimides via nylon-salt-type monomers derived from aliphatic diamines and benzophenonetetracarboxylic acid

✍ Scribed by Meenakshi Goyal; Tatsuo Inoue; Masa-Aki Kakimoto; Yoshio Imai

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 159 KB
Volume: 36
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19980115)36:1<39::aid-pola7>3.0.co;2-x

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✦ Synopsis

Aliphatic polyimides (P-XBTA) having inherent viscosities of 0.4-1.4 dL/ g were readily synthesized by the high-pressure polycondensation of the salt monomers, composed of aliphatic diamines having various methylene chain lengths ( X Å 4-12) and 3,3,4,4-benzophenonetetracarboxylic acid (BTA), under 200-250 MPa at 200-320ЊC. The salt monomers with odd-numbered methylene units were found to be more susceptible to crosslinking than those containing even-numbered methylene chains. The polyimides having even-numbered methylene units were highly crystalline, whereas those with odd-numbered methylene chains were crosslinked and therefore amorphous with only one exception, i.e., P-11BTA. The thermal behavior of these polymers was also studied.

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