Lanthanide(III)-polyimide nanocomposites: Enhancement of dimensional stability
- William and Mary, Williamsburg, VA (United States); and others
The addition of lanthanide(RI) acetate and tris(2,4-pentanedionato)lanthanum(III) complexes to the soluble, low dielectric, colorless polyimides formed from 2,2-bis(3,4-dicarboxyphenyl)hexa-fluoropropanedianhydride/1,3-bis-(aminophenoxy)benzene, (6FDA/APB), and 6FDA/2,2-bis[4-4-aminophenoxy]hexa-fluoropropane, 6FDA/BDAF, was investigated with the expectation that thermal treatment of doped resin films would lead to an isotropic reduction in the linear coefficient of thermal expansion (CTE) while maintaining the essential properties of the parent polyimide. To realize visually clear metal-doped films the inorganic phase particle size, after thermal treatment, must be less than ca. 200 nm. This can only be accomplished by using Ln complexes which are soluble in the curing polymer matrix. Ln acetates gave homogeneous, visually clear films with manometer size inorganic clusters and slightly lowered CTE`s. The Ln-2,4-pentanedionates gave films with large CTE lowerings while maintaining visual clarity and acceptable mechanical and thermal properties. RI measurements indicate that the films are isotropic. TEM data are consistent with particle sizes for the lanthanide ion containing species which are in the manometer range. Dielectric constants (8-12 GHz) remain low.
- OSTI ID:
- 370886
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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