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STRUCTURE, PROPERTIES AND APPLICATIONS OF LAYERED MATERIALS: MULTILAYERED FILMS AND AEROGEL COMPOSITES

Sun, Mingze
http://rave.ohiolink.edu/etdc/view?acc_num=case1512489068284179

Abstract Details

2018, Doctor of Philosophy, Case Western Reserve University, Macromolecular Science and Engineering.
Materials with layered structures are of increased importance in current the disciplines of solid state chemistry, physics and engineering, due to their integration of single layers and flexibility in design and process. Many current technologies utilize layered materials to realize functions, such as barrier and layered multifunctional foam-like films. Two such classes of layered materials are studied in this present work: multilayered polymer barrier films and layered clay aerogel composites. Multilayered barrier films A polymer-based multilayer film system and related modified versions have prepared in this part of the thesis. These materials were designed with superior barrier properties, and can be used for encapsulation of organic photovoltaic (PV) devices. Such encapsulation is important because the active elements of the PV devices are easy to degrade and lose function when exposed to oxygen and water vapor. In addition to barrier properties, integrated with flexible organic PV devices have the requirements of flexibility and transparency. Multilayered films with “inorganic-organic” external coatings exhibit superior barrier properties as well as stable mechanical performance and 90+% transparency to the UV-vis spectrum. Applying those barrier films over the organic solar cells can elongate the shelf time of devices from several days to 3 months or more. Aerogel composite systems Clay/PVOH aerogels fabricated via freeze-drying, are ultra-low density and foam-like materials. Reinforcement by keratin-fibers can further improve their mechanical performance as well as insulation properties, not only from adding materials, but also from inner morphology change which can be observed through SEM and µCT. Those structural changes which make an impact on properties come from processing condition changes. A study has been conducted to determine the relationship between rheological properties of gels under different processing conditions and the performance of the final aerogel products made from those gels. A link, correlating rheology with final properties, may make it possible to predict aerogels’ performance before freeze drying.
David Schiraldi (Committee Chair)
Eric Baer (Committee Member)
Gary Wnek (Committee Member)
Emily Pentzer (Committee Member)
240 p.
Plastics; Polymers
Polymer; Structure-property relations; Multilayer films; Aerogels

Recommended Citations

Citations

  • Sun, M. (2018). STRUCTURE, PROPERTIES AND APPLICATIONS OF LAYERED MATERIALS: MULTILAYERED FILMS AND AEROGEL COMPOSITES [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1512489068284179

    APA Style (7th edition)

  • Sun, Mingze. STRUCTURE, PROPERTIES AND APPLICATIONS OF LAYERED MATERIALS: MULTILAYERED FILMS AND AEROGEL COMPOSITES. 2018. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1512489068284179.

    MLA Style (8th edition)

  • Sun, Mingze. "STRUCTURE, PROPERTIES AND APPLICATIONS OF LAYERED MATERIALS: MULTILAYERED FILMS AND AEROGEL COMPOSITES." Doctoral dissertation, Case Western Reserve University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=case1512489068284179

    Chicago Manual of Style (17th edition)

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This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.