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M Herbert Dissertation Final.pdf (4 MB)

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Structure Property Relationships in Multilayered Thin Films: Mechanical and Gas Barrier Applications

Herbert, Matthew
http://rave.ohiolink.edu/etdc/view?acc_num=case1441968026

Abstract Details

2015, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science and Engineering.
In both academic and industrial locations, the study of the structure property relationships of multilayered thin films has become an area of significant interest for investigation and discovery. As layer-multiplying coextrusion continues to evolve into the nanoscale regime, new opportunities arise to discover unique properties controlled by interfacial or confinement induced phenomena. The first part of the thesis (Chapter 2) explores a series of isotactic polypropylene and nylon 6 blends with silsesquioxane (POSS) additives, which are layered to nanometer thicknesses within multilayered films, to test the effects of confinement upon polymer property modification. POSS has been previously shown to enhance the properties of polymer matrices in which the POSS molecules have been grafted to, or copolymerized within the chain, but there is a lack of understanding in melt-blend systems. The second and third parts of the thesis (Chapters 3 and 4), investigates various strategies to improving the gas barrier properties in multilayered polymer films. In Chapter 3, ultra-low glass transition temperature phosphate glasses (Pglass) are used as inorganic fillers within maleated polypropylene, with the goal of elongating the Pglass particles into high aspect ratio platelets upon biaxial orientation. In comparison to 14 previous work with a higher Tg Pglass, the newer Pglass was expected to possess improved drawing properties, yielding oriented films with higher aspect ratio platelets, and thus enhanced barrier properties. The Pglass, however, formed phase separated aggregates, resulting in the formation of voids upon drawing. In Chapter 3, a slightly different strategy was utilized to obtain improvements to film barrier properties, which involved the infusion of oxygen scavenging Palladium (Pd) nanoparticles into the polymer matrix. Infusion of as little as 4 x 10-5 vol.% Pd into multilayered films resulted in the reduction of oxygen permeability by 3-4 orders of magnitude. The combination of metal nanoparticles dispersed throughout the polymer free volume, with the added effect of nano-scale Pd films deposited at layer interfaces, has yielded thin, flexible and transparent multilayered films for potential applications such as flexible organic electronics encapsulation.
David Schiraldi (Advisor)
Eric Baer (Committee Member)
LaShanda Korley (Committee Member)
Mark DeGuire (Committee Member)
238 p.
Engineering; Polymers
Multilayer, Thin Film, Structure Property Relationship, Polymer

Recommended Citations

Citations

  • Herbert, M. (2015). Structure Property Relationships in Multilayered Thin Films: Mechanical and Gas Barrier Applications [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1441968026

    APA Style (7th edition)

  • Herbert, Matthew. Structure Property Relationships in Multilayered Thin Films: Mechanical and Gas Barrier Applications. 2015. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1441968026.

    MLA Style (8th edition)

  • Herbert, Matthew. "Structure Property Relationships in Multilayered Thin Films: Mechanical and Gas Barrier Applications." Doctoral dissertation, Case Western Reserve University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1441968026

    Chicago Manual of Style (17th edition)

case1441968026
1,118
© 2015, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.