Fabrication of Polymer Shells Using a Depolymerizable Mandrel

Letts, Stephan A.; Fearon, E. M.; Buckley, Steven R.; Saculla, M. D.; Allison, Leslie M.; Cook, Robert

doi:10.13182/fst28-5-1797

Cited by 71 publications

(20 citation statements)

References 8 publications

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“…We did not test these material properties for this study, but solution‐synthesized PDVB has been shown to be thermally stable at 300 °C in inert environments, and iCVD‐synthesized PDVB has a reported modulus of >5 GPa . Plasma polymer of trans ‐2‐butene is stable at 300 °C in nitrogen, and has a modulus of ∼3 GPa. The properties of hydrocarbon plasma polymers are relatively insensitive to the identity of the hydrocarbon precursor, thereby facilitating a comparison between CVD processes despite the use of different precursors .…”

Section: Resultsmentioning

confidence: 99%

“…Plasma Polymer Film Fabrication : Plasma polymers of trans ‐2‐butene were synthesized in a custom‐built, inductively‐coupled plasma chamber as previously described . Trans ‐2‐butene (95%, Matheson Tri‐Gas) and hydrogen (Ultra‐high purity grade, Air Liquide) flowed into the chamber at flowrates of ∼0.1 sccm and 10 sccm, respectively, with the chamber pressure maintained at 100 mTorr.…”

Section: Methodsmentioning

confidence: 99%

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Photo‐oxidation of Polymers Synthesized by Plasma and Initiated CVD

Baxamusa

Suresh

Ehrmann

et al. 2015

Chemical Vapor Deposition

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Plasma polymers are often limited by their susceptibility to spontaneous and photo-oxidation. We show that the unusual photoluminescence (PL) behavior of a plasma polymer of trans-2-butene is correlated with its PL strength. These photoprocesses occur under blue light illumination (l ¼ 405 nm), distinguishing them from traditional ultraviolet degradation of polymers. These photo-active defects are likely formed during the plasma deposition process, and we show that a polymer synthesized using initiated (i)CVD, a non-plasma method, has 1000Â lower PL signal and enhanced photo-stability. Nonplasma methods, such as iCVD, may therefore be a route to overcoming material aging issues that limit the adoption of plasma polymers.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Photo‐oxidation of Polymers Synthesized by Plasma and Initiated CVD

Baxamusa

Suresh

Ehrmann

et al. 2015

Chemical Vapor Deposition

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“…GDP was synthesized in a custom-built inductively-couple plasma reactor. 12,20 The chamber was maintained at 0.1 Torr while trans-2-butene (95%, Matheson Tri-Gas) and H 2 (ultra-high purity grade, Air Liquide) flowed into the chamber at flowrates of ~0.1 sccm and 10 sccm, respectively. The plasma frequency was 43.015 MHz and the power was 13.5 W, unless otherwise specified.…”

Section: 1synthesis Of Plasma Cvd A-c:h (Gdp)mentioning

confidence: 99%

Photo-oxidation of polymer-like amorphous hydrogenated carbon under visible light illumination

Baxamusa

Laurence

Worthington

et al. 2015

Polymer Degradation and Stability

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Amorphous hydrogenated carbon (a-C:H), a polymer-like network typically synthesized by plasma chemical vapor deposition, has long been known to exhibit optical absorption of visible light (λ > 400 nm). Here, we report that this absorption is accompanied by rapid photooxidation (within minutes) that behaves in most respects like classic polymer photo-oxidation with the exception that it occurs under visible light illumination rather than ultraviolet illumination. Lower plasma power during deposition produces a-C:H that is less crosslinked, is less absorptive, has longer photoluminescence lifetimes, and has a slower photo-oxidative degradation than a-C:H deposited at higher plasma power. The optical gap of the material deposited here is ~2.5 eV, and we correspondingly observe photo-oxidation at photon energies of 2.7 and 3.1 eV. A reduced photo-oxidative response is observed at sub-gap energies, suggesting that defect states or absorption tails enable absorption at lower energies. The photo-oxidation depends on both the total accumulated dose as well as the intensity of the illumination,

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“…1,2 Previous efforts have made possible the fabrication of aromatic polyimide capsules from pyromellitic dianhydride ͑PMDA͒ and 4 , 4Ј-oxydianiline ͑ODA͒ by employing a technique based upon vapor-phase polymerization, [3][4][5] or by an emulsion technique, 6 and the properties of the capsules critical to the ICF application were assessed. [7][8][9][10] It was verified that the PMDA-ODA polyimide capsules, prepared via the vapor-deposition technique, possessed comparable yet distinct properties from the commercial PMDA-ODA polyimide ͑Kapton͒, produced by solutionbased methods.…”

Section: Introductionmentioning

confidence: 99%

Properties and structure of vapor-deposited polyimide upon electron-beam irradiation

Tsai

Kuo

Harding

2006

Journal of Applied Physics

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Vapor-deposited polyimide capsules from pyromellitic dianhydride and 4,4′-oxydianiline were irradiated with an electron beam that mimicked the β-radiation emitted by tritium, a fuel that the capsules are to contain during the inertial confinement fusion process. The mechanical properties and gas permeability of the irradiated capsules were measured to examine their radiation resistance. Upon electron-beam irradiation at an energy of 8keV and a dose of 120MGy, the capsules showed 15% and 56% decrease in tensile strength and elongation at break, respectively, without significant change in gas permeability and Young’s modulus. Analyses using x-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy indicated that the chain cleavage and carbonization occurred but were confined in a thin layer at the top surface of the capsules. The shallow penetration of the low-energy electron beam used, as well as the existence of cross-linking in the vapor-deposited polyimide, may have led to the smaller magnitude of property degradation in the capsules compared to that reported for solution-cast polyimide.

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Fabrication of Polymer Shells Using a Depolymerizable Mandrel

Cited by 71 publications

References 8 publications

Photo‐oxidation of Polymers Synthesized by Plasma and Initiated CVD

Photo‐oxidation of Polymers Synthesized by Plasma and Initiated CVD

Photo-oxidation of polymer-like amorphous hydrogenated carbon under visible light illumination

Properties and structure of vapor-deposited polyimide upon electron-beam irradiation

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