1. Properties of polyimide shells made using vapor phase deposition
- Author
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Shawhorng Chen, R. Q. Gram, E. L. Alfonso, and D. R. Harding
- Subjects
Materials science ,Mechanical Engineering ,Condensed Matter Physics ,chemistry.chemical_compound ,Monomer ,chemistry ,Mechanics of Materials ,Residual stress ,Physical vapor deposition ,Ultimate tensile strength ,General Materials Science ,Composite material ,Elastic modulus ,Inertial confinement fusion ,Polyimide ,Curing (chemistry) - Abstract
Hollow polyimide shells, to be used in inertial confinement fusion experiments, were fabricated by codepositing monomer precursors onto spherical mandrels. Polyimide shells with 700 to 950 μm diameters and 4 to 13 μm wall thicknesses were produced. The shell wall shrunk 20–30% due to imidization. Burst and buckle pressure tests on these shells yielded estimated mechanical strength properties: ∼ 15 GPa elastic modulus and ∼ 300 MPa tensile strength. The permeability of D2 through polyamic acid at 298 K was 7.4 × 10−17 mol · m/m2 · Pa · s and increased to 6.4 × 10−16 mol · m/m2 · Pa · s upon curing the shell to 150 °C. The permeability of D2 at 298 K through vapor-deposited polyimide flat films was 240 times greater than through polyamic acid.
- Published
- 1998
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