Polyimide films from vapor deposition: toward high strength, NIF capsules

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The focus of recent efforts at LLNL has been to demonstrate that vapor deposition processing is a suitable technique to form polyimide fnms with sufficient strength for current national ignition facility target specifications. Production of polyimide films with controlled stoichiometry was acccomplished by: 1) depositing a novel co-functional monomer and 2) matching the vapor pressure of each monomer in PMDA/ODA co-depositions. The sublimation and deposition rate for the monomers was determined over a range of temperatures. Polyimide films with thicknesses up to 30 p.m were fabricated. Composition, structure and strength were assessed using FTIR, SEM and biaxial burst testing. The ... continued below

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1.6 Mbytes

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Cook, R C; Hsieh, E J; Letts, S A; Roberts, C C & Saculla, M October 16, 1998.

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Description

The focus of recent efforts at LLNL has been to demonstrate that vapor deposition processing is a suitable technique to form polyimide fnms with sufficient strength for current national ignition facility target specifications. Production of polyimide films with controlled stoichiometry was acccomplished by: 1) depositing a novel co-functional monomer and 2) matching the vapor pressure of each monomer in PMDA/ODA co-depositions. The sublimation and deposition rate for the monomers was determined over a range of temperatures. Polyimide films with thicknesses up to 30 p.m were fabricated. Composition, structure and strength were assessed using FTIR, SEM and biaxial burst testing. The best films had a tensile strength of approximately 100 MPa. A qualitative relationship between the stoichiometry and tensile strength of the film was demonstrated. Thin films ({approximately}3.5 {micro}m) were typically smooth with an rms of 1.5 nm.

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1.6 Mbytes

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  • Target Fabrication Meeting '98, Jackson Hole, WY, April 19-23, 1998

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  • Other: DE00005781
  • Report No.: UCRL-JC-132194
  • Grant Number: W-7405-Eng-48
  • Office of Scientific & Technical Information Report Number: 5781
  • Archival Resource Key: ark:/67531/metadc692844

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • October 16, 1998

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 6, 2016, 11:23 p.m.

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Cook, R C; Hsieh, E J; Letts, S A; Roberts, C C & Saculla, M. Polyimide films from vapor deposition: toward high strength, NIF capsules, article, October 16, 1998; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc692844/: accessed January 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.