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Synthesis and Characterization of Polyimides Derived from (3-Amino-2,4,6-trimethylphenyl)-(3′-aminophenyl)methanone and Aromatic Dianhydrides by Z. X. Li; L. Q. Lin; W. M. Zhang; T. Wu; J. L. Pu is a Materials Science article available to read on EtoBox.

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## Abstract A series of new polyimides were prepared via the polycondensation of (3‐amino‐2,4,6‐trimethylphenyl)‐(3′‐aminophenyl)methanone and aromatic dianhydrides, that is, 3,3′,4,4′‐biphenyltetracarboxylic dianhydride (BPDA), 4,4′‐oxydiphthalic anhydride, 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride, and 2,2′‐bis(3,4‐dicarboxyphenyl) hexafluoropropane dianhydride. The structures of the polyimides were characterized by Fourier transform infrared and NMR measurements. The properties were evaluated by solubility tests, ultraviolet–visible analysis, differential scanning calorimetry, and thermogravimetric analysis. The two different meta‐position‐located amino groups with respect to the carbonyl bridge in the diamine monomer provided it with an unsymmetrical structure. This led to a restriction on the close packing of the resulting polymer chains and reduced interchain interactions, which contributed to the solubility increase. All the polyimides except that derived from BPDA had good solubility in strong aprotic solvents, such as __N__‐methyl‐2‐pyrrolidinone, __N,N__′‐dimethylacetamide, __N,N__‐dimethylformamide, and dimethyl sulfone, and in common organic solvents, such as c

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Author

Z. X. Li; L. Q. Lin; W. M. Zhang; T. Wu; J. L. Pu

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0887-624X)

Published

2005

Language

EN

Field

Materials Science (Physical Sciences)