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    • Graduate School - MU Theses and Dissertations (MU)
    • Theses and Dissertations (MU)
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    • 2007 Dissertations (MU)
    • 2007 MU dissertations - Access restricted to UM
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    Biodegradable packaging for corrosion inhibition via supercriticial fluid

    Leavitt, Leah A., 1980-
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    [PDF] public.pdf (2.184Kb)
    [PDF] short.pdf (8.392Kb)
    [PDF] research.pdf (1.054Mb)
    Date
    2007
    Format
    Thesis
    Metadata
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    Abstract
    [ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The focus of this study is to develop a packaging material that is both biodegradable (BD) and provides corrosion protection for a packaged metal substrate. In this study, supercritical carbon dioxide is used to infuse Ecoflex[registered trademark] resin, a BD aliphatic-aromatic copolyester, with sodium nitrite (NaNO[subscript 2]), which is a common volatile corrosion inhibitor (VCI). The effects of supercritical fluid (SCF) density upon the infusion depth were examined first. For this study, 10 g of Ecoflex[registered trademark] was infused with NaNO[subscript 2] using SCF densities that ranged from 0.15-0.62 g/cm[subscript 3]. The results demonstrated that fluid density does not play a significant role in infusion depth. However, the influence of temperature on infusion depth is significant at 95%. The second phase of this work focused on producing a VCI-infused package and determining its ability to prevent iron corrosion. The corrosion protection capabilites of VCI-infused biodegradable polymer was compared to packages of VCI-infused linear low-density polyethylene (LLDPE), uninfused Ecoflex[registered trademark], uninfused LLDPE, and an unpackaged control. The corrosion rate of the control, uninfused LLDPE, VCI-LLDPE, uninfused Ecoflex[registered trademark], and VCI-Ecoflex[registered trademark] were 0.00353 mm/yr, 0.00089 mm/yr, 0.00048 mm/yr, 0.00297 mm/yr, and 0.00033mm/yr, respectively. The VCI-infused packages provided the most protection, with the VCIEcoflex[registered trademark] resulting in 90.7% less corrosion. Furthermore, scanning electron microscopy (SEM) studies show that the film integrity was maintained during the SCF infusion process. These findings demonstrate the infusion capability of a SCCO[subscript 2] system, and help elucidate the effects of processing conditions on the infusion quality of the final product. Additionally, the corrosion protection ability of the infused films was verified.--From public.pdf
    URI
    https://doi.org/10.32469/10355/6013
    https://hdl.handle.net/10355/6013
    Degree
    Ph. D.
    Thesis Department
    Chemical engineering (MU)
    Rights
    Access is limited to the campuses of the University of Missouri.
    Collections
    • 2007 MU dissertations - Access restricted to UM
    • Chemical Engineering electronic theses and dissertations (MU)

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