Enhancement of dimensional stability in soluble polyimides via lanthanide(III) acetate additives

Journal Article · Sun Mar 31 23:00:00 EST 1996 · Journal of Advanced Materials

OSTI ID:263169

Southward, R E; Thompson, D S; Thompson, D W ^[1]; Clair, A K ^[2]

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1. College of William and Mary, Williamsburg, VA (United States)
2. NASA-Langley Research Center, Hampton, VA (United States)

Soluble lanthanide(III) acetate tetrahydrates have been added to dimethylacetamide solutions of the soluble colorless polyimide 6FDA/3,3`-APB formed from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride and 1,3-bis(3-amino-phenoxy)benzene to effect the isotropic lowering of the linear coefficient of thermal expansion (CTE) of the resulting polyimide films. Thermal treatment of the doped films generates an inorganic lanthanide phase which consists of particles from 20-40 nm in the bulk of the film and lowers the CTE`s up to 12 percent(relative to controls with the same thermal history). The thermal and mechanical properties of the doped polyimide films are retained. The films retain the optical transparency of the parent polyimide. 37 refs., 3 figs., 5 tabs.

• OSTI ID: 263169
• Journal Information: Journal of Advanced Materials, Journal Name: Journal of Advanced Materials Journal Issue: 3 Vol. 27; ISSN 1070-9789; ISSN JADMEK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ACETATES
DIMENSIONS
DOPED MATERIALS
EXPERIMENTAL DATA
FILMS
ORGANOMETALLIC COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
RARE EARTH COMPLEXES
STABILITY
THERMAL EXPANSION