Title page for etd-0101118-125854


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URN etd-0101118-125854
Author Oleksii Altukhov
Author's Email Address No Public.
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Department Materials and Optoelectronic Science
Year 2017
Semester 1
Degree Ph.D.
Type of Document
Language English
Title PEO Based Polymers for Supramolecular and Mesoporous Materials Applications
Date of Defense 2018-01-23
Page Count 176
Keyword
  • multiple hydrogen bonding
  • supramolecular structure
  • block copolymer
  • mesoporous materials
  • crystallization
  • polymer electrolytes
  • Abstract In this study, we have combined, few directions into one fundamental work. In the first part of this study, we tethered terminal uracil groups onto short-chain poly(ethylene glycol) (PEG) to form the polymers, uracil (U)-PEG and U-PEG-U. Differential scanning calorimetry, wide-angle X-ray scattering, 7Li nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy revealed that the presence of the uracil groups in the solid state electrolytes had a critical role in tuning the glass transition temperatures and facilitating the transfer of Li+ ions. Then, we have synthesized a multi-diamidopyridine-functionalized polyhedral oligomeric silsesquioxane (MD-POSS) and blend it with U-PEG and U-PEG-U copolimers. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) revealed that supramolecular structures self-assembled from mixtures of MD-POSS and U–PEG and from MD-POSS and U–PEG–U.
    In second part of this study we employed poly(ethylene oxide-b-lactide) (PEO-b-PLA) diblock copolymers as templates to prepare mesoporous silica materials. Data reveals, that interaction in the system led to the formation of a variety of composition-dependent mesoporous structures, including hexagonally packed cylinders, face-centered cubic-packed spheres, and disordered spherical micelle structures. When using POSS derivatives as silica precursor, we have found out, that formation of micelles with incorporation of crystallized POSS segments in between “arms” of the micelle is more favorable than any other formation. As a result, the ratio of template to precursor can be used to control the formation of the micelle like structures in the future.
    Advisory Committee
  • Jem-Kun Chen - chair
  • Chih-Feng Wang - co-chair
  • Yeo-Wan Chiang - co-chair
  • Chih-Feng Huang - co-chair
  • Shiao-Wei Kuo - advisor
  • Files
  • etd-0101118-125854.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2018-02-01

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