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Design, Synthesis and Self-Assembly ...

Shan, Wenpeng,

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Design, Synthesis and Self-Assembly of Giant Molecules, Including Giant Surfactants and Giant Tetrahedrons Based on POSS Nanoparticles /

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Design, Synthesis and Self-Assembly of Giant Molecules, Including Giant Surfactants and Giant Tetrahedrons Based on POSS Nanoparticles // Wenpeng Shan.
作者:	Shan, Wenpeng,
面頁冊數:	1 electronic resource (208 pages)
附註:	Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
Contained By:	Dissertations Abstracts International84-11B.
標題:	Chemistry. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30540990
ISBN:	9798379523305

Design, Synthesis and Self-Assembly of Giant Molecules, Including Giant Surfactants and Giant Tetrahedrons Based on POSS Nanoparticles /
Shan, Wenpeng,

Design, Synthesis and Self-Assembly of Giant Molecules, Including Giant Surfactants and Giant Tetrahedrons Based on POSS Nanoparticles /Wenpeng Shan. - 1 electronic resource (208 pages)

Source: Dissertations Abstracts International, Volume: 84-11, Section: B.

The self-assemble behavior of various giant surfactants with different functionalities and molecular architectures, which consist of compact and rigid molecular nanoparticles (MNPs) as head and flexible polymer chains as tail, is systematically studied. The benefit of utilizing MNPs comparing with AB type di-block copolymer which has become the model for probing microphase separation in bulk state is that the MNPs could be versatile functionalized at will to fabricate functional materials via collective secondary interactions. Herein, we investigated the effect of rigid-rod junction between two blocks of giant surfactants in bulk state using small angle X-ray scattering and transmission electron microscopy. Besides the segmental interaction (Flory-Huggins parameter) and volume fraction of one component (f), the interfacial energy takes a vital role in the process of self-assembly. By way of about 1 nm rigid-rod junction inserted into the giant surfactant system, the pathways of order-order phase transition (OOT) could be varied due to different molecular weight of polystyrene attached inducing diverse levels of gibbs free energy with temperature increasing, one proceeds from lamellar structure (LAM) directly to the hexagonally packed cylinder structure (CYL), one passes by the double gyroid structure (DG), another one travels from LAM to hexagonally perforated layer structure (HPL), then DG, finally reaches to the stable state, CYL that possesses the most curved interfacial area in these previous mentioned structures. And the model which describes these sorts of phase behaviors with interfacial tension and packing frustration competing each other could be verified via the phenomena that curved lamellar defects observed both in bright field TEM image and small angle x-ray scattering data, which could be occurred due to the relaxation of polymer chains promoting the increase of interfacial area without loosening the imbalance of chain crowding because of tightly packed MNPs to stimulate the OOT. This prototype of phase transition supporting a fully described phase diagram provides clues to control polymer self-assembly and fine-tune the morphology and phase behaviors at the nanometer scales.In the second topic, the giant tetrahedron was fabricated on the adamantane core, same as the mechanisms of disk shape molecules forming spherical phase structures, the steric hindrance from POSS cages impeded the growth of cylindrical columns, and spherical phase structures could be achieved based on the experimental data of BCC structure appearing. And this type of fabricating spherical phase structures could pave another road to get Frank-Kasper phases with different sizes of spheres.

English

ISBN: 9798379523305Subjects--Topical Terms:

516420
Chemistry.
Subjects--Index Terms:

Giant molecules

Design, Synthesis and Self-Assembly of Giant Molecules, Including Giant Surfactants and Giant Tetrahedrons Based on POSS Nanoparticles /
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300 $a 1 electronic resource (208 pages)
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500 $a Source: Dissertations Abstracts International, Volume: 84-11, Section: B.
500 $a Advisors: Cheng, Stephen Z. D. Committee members: Liu , Tianbo; Zhu, Yu; Miyoshi, Toshikazu ; Wesdemiotis, Chrys .
502 $b Ph.D. $c The University of Akron $d 2018.
520 $a The self-assemble behavior of various giant surfactants with different functionalities and molecular architectures, which consist of compact and rigid molecular nanoparticles (MNPs) as head and flexible polymer chains as tail, is systematically studied. The benefit of utilizing MNPs comparing with AB type di-block copolymer which has become the model for probing microphase separation in bulk state is that the MNPs could be versatile functionalized at will to fabricate functional materials via collective secondary interactions. Herein, we investigated the effect of rigid-rod junction between two blocks of giant surfactants in bulk state using small angle X-ray scattering and transmission electron microscopy. Besides the segmental interaction (Flory-Huggins parameter) and volume fraction of one component (f), the interfacial energy takes a vital role in the process of self-assembly. By way of about 1 nm rigid-rod junction inserted into the giant surfactant system, the pathways of order-order phase transition (OOT) could be varied due to different molecular weight of polystyrene attached inducing diverse levels of gibbs free energy with temperature increasing, one proceeds from lamellar structure (LAM) directly to the hexagonally packed cylinder structure (CYL), one passes by the double gyroid structure (DG), another one travels from LAM to hexagonally perforated layer structure (HPL), then DG, finally reaches to the stable state, CYL that possesses the most curved interfacial area in these previous mentioned structures. And the model which describes these sorts of phase behaviors with interfacial tension and packing frustration competing each other could be verified via the phenomena that curved lamellar defects observed both in bright field TEM image and small angle x-ray scattering data, which could be occurred due to the relaxation of polymer chains promoting the increase of interfacial area without loosening the imbalance of chain crowding because of tightly packed MNPs to stimulate the OOT. This prototype of phase transition supporting a fully described phase diagram provides clues to control polymer self-assembly and fine-tune the morphology and phase behaviors at the nanometer scales.In the second topic, the giant tetrahedron was fabricated on the adamantane core, same as the mechanisms of disk shape molecules forming spherical phase structures, the steric hindrance from POSS cages impeded the growth of cylindrical columns, and spherical phase structures could be achieved based on the experimental data of BCC structure appearing. And this type of fabricating spherical phase structures could pave another road to get Frank-Kasper phases with different sizes of spheres.
546 $a English
590 $a School code: 0003
650 4 $a Chemistry. $3 516420
650 4 $a Polymer chemistry. $3 3173488
650 4 $a Nanoscience. $3 587832
653 $a Giant molecules
653 $a Self-assembly
653 $a POSS nanoparticles
653 $a Phase transitions
690 $a 0485
690 $a 0565
690 $a 0495
710 2 $a The University of Akron. $b Polymer Science. $e degree granting institution. $3 3816404
720 1 $a Cheng, Stephen Z. D. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 84-11B.
790 $a 0003
791 $a Ph.D.
792 $a 2018
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30540990