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Master Thesis of Kening Lang.pdf (5.81 MB)

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Topological Effect on Self-assembly Behavior of Precisely Synthesized AmBn type Giant Molecules

Lang, Kening
http://rave.ohiolink.edu/etdc/view?acc_num=akron1490651233006441

Abstract Details

2017, Master of Science, University of Akron, Polymer Science.
Previous study has demonstrated that several F-K phases as well as the classical phases can be formed by a set of precisely defined A-Bn type giant molecules which are constructed by one hydrophilic polyhedral oligomeric silsesquioxane (DPOSS that represents fourteen hydroxyl groups functionalized POSS cage) connected with different number of hydrophobic POSS cages (BPOSS that represents seven isobutyl groups functionalized POSS). Besides the change of BPOSS number, the topological effect could also play an essential role in varying the supramolecular structures. Here in this thesis, we focus on changing the topological properties of AmBn type giant molecules with the same volume fraction and trying to study their influence on the structure formation. Three topological effects are selected here, one is the comparison of the structure formation by DPOSSm-BPOSSn giant molecules and its corresponding DPOSS2m-BPOSS2n sample. The results indicated that the supramolecular structure changes from double gyroids (DG) to the hexagonal close-packed cylinder (HEX) by linking two DPOSS-2BPOSS together into 2DPOSS-4BPOSS. Another effect is varying cone angle of “cone-shaped” giant molecules within same volume fraction. In order to achieve this, one DPOSS was linked with six BPOSS(s) with rigid linkers. By changing the length of the rigid linker, a set of “cone-shaped” building blocks with different cone angles were synthesized. The results indicated that the supramolecular structure changes from Amorphous to body-centered cubic (BCC) by adding two aryl rings as a rigid linker from DPOSS-6BPOSS to DPOSS-2aryl-6BPOSS. The third effect is about changing the rigidity or the number of the POSS cages (the size of these giant molecules), we expected to see them in a variety of different thermal, dynamical, and rheological behavior. We will further study their phase formation behaviors. Systematic variation of the topological parameter would provide a new insight into the molecular design and supramolecular structure formation of the giant molecular system.
Stephen Cheng (Advisor)
Toshikazu Miyoshi (Committee Member)
58 p.
Chemistry; Materials Science; Physical Chemistry; Polymer Chemistry; Polymers
Topological Effect; Self-assembly Behavior; Giant Molecules; Frank Kasper phases; POSS

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Citations

  • Lang, K. (2017). Topological Effect on Self-assembly Behavior of Precisely Synthesized AmBn type Giant Molecules [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490651233006441

    APA Style (7th edition)

  • Lang, Kening. Topological Effect on Self-assembly Behavior of Precisely Synthesized AmBn type Giant Molecules . 2017. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1490651233006441.

    MLA Style (8th edition)

  • Lang, Kening. "Topological Effect on Self-assembly Behavior of Precisely Synthesized AmBn type Giant Molecules ." Master's thesis, University of Akron, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1490651233006441

    Chicago Manual of Style (17th edition)

akron1490651233006441
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This open access ETD is published by University of Akron and OhioLINK.