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Synthesis and characterization of novel polyimides with bulky pendant groups

✍ Scribed by David Ayala; Angel E. Lozano; Javier De Abajo; José G. De La Campa

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
159 KB
Volume
37
Category
Article
ISSN
0887-624X

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✦ Synopsis

New dianhydrides containing t-butyl and phenyl pendant groups have been synthesized and used as monomers, together with commercial diamines, to prepare novel polyimides. The influence of the chemical structure of the monomers on their reactivity has been studied by quantum semiempirical methods. The polyimides have been characterized by FTIR and by NMR in the case of soluble polymers. The presence of pendant groups and the method used to imidize polyimide precursors greatly affected polymer properties such as solubility, glass transition temperature, thermal stability, and mechanical properties. As a rule, the novel polyimides showed better solubility in organic solvents than the parent polyimides. Glass transition temperatures in the range 250 -270°C and decomposition temperatures over 520°C were observed for the set of current polymers. Tensile strengths up to 135 MPa and mechanical moduli up to 3.0 GPa were measured on films of the current polyimides.

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