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Synthesis and Self-assembly of Planar Giant Molecules Based on Polyhedral Oligomeric Silsesquioxanes(POSS)

Jin, Lun
http://rave.ohiolink.edu/etdc/view?acc_num=akron1490653139392999

Abstract Details

2017, Master of Science, University of Akron, Polymer Science.
The giant molecule is a kind of macromolecule with high molecular weight and precisely defined chemical structure. The self-assembly behavior of giant molecule can be influenced by intermolecular interactions, such as hydrogen bonding, hydrophobic force, metal coordination, van der Waals forces, p- p interactions and electrostatic effects. Besides the chemical interaction, the geometrical factor will also influence the final structure. POSS is a rigid conformation and fixed volume cage molecule with silicon-oxygen backbone. The precisely definable of the functional groups of POSS corresponding to the vertex number makes them fascinating building blocks. In the previous work, it was reported that POSS based three dimensional giant polyhedrons could self-assembly into Frank-Kasper A15 phase. [1] In this thesis, two dimensional planar giant molecules were designed and synthesized to explore novel self-assembly behaviors. Gallic acid derivatives C12 and BPOSS were linked to a simple planar C3 symmetric core, utilizing Sonogashira coupling reaction. By controlling the number of isobutyl-POSS, a series of giant molecules, 3C12-TEB, 2C12-TEB-1BPOSS and 1C12-TEB-2BPOSS were synthesized and studied. This series of target giant molecules were characterized by 1H NMR, 13C NMR, GPC and MALDI-TOF mass spectra. Their physical properties were studied by DSC and temperature-resolved SAXS. Two giant molecules, 2C12-TEB-1BPOSS and 1C12-TEB-2BPOSS, were discovered of hexagonal phase in bulk state.
Stephen Cheng (Advisor)
Toshikazu Miyoshi (Committee Member)
52 p.
Materials Science; Molecular Physics; Nanoscience; Physical Chemistry; Polymer Chemistry
Giant molecules; Self-assembly; POSS; Hexagonal; Supramolecular Chemistry

Recommended Citations

Citations

  • Jin, L. (2017). Synthesis and Self-assembly of Planar Giant Molecules Based on Polyhedral Oligomeric Silsesquioxanes(POSS) [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490653139392999

    APA Style (7th edition)

  • Jin, Lun. Synthesis and Self-assembly of Planar Giant Molecules Based on Polyhedral Oligomeric Silsesquioxanes(POSS). 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1490653139392999.

    MLA Style (8th edition)

  • Jin, Lun. "Synthesis and Self-assembly of Planar Giant Molecules Based on Polyhedral Oligomeric Silsesquioxanes(POSS)." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490653139392999

    Chicago Manual of Style (17th edition)

akron1490653139392999
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© 2017, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.