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PERFLUOROCARBON MEDIATED SELF-ASSEMBLY OF POLYMERS
by
Jingguo Shen
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(CHEMISTRY)
August 2009
Copyright 2009 Jingguo Shen
Object Description
| Title | Perfluorocarbon mediated self-assembly of polymers |
| Author | Shen, Jingguo |
| Author email | jshen@usc.edu; jgshen@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Chemistry |
| School | College of Letters, Arts and Sciences |
| Date defended/completed | 2009-03-26 |
| Date submitted | 2009 |
| Restricted until | Unrestricted |
| Date published | 2009-08-05 |
| Advisor (committee chair) | Hogen-Esch, Thieo H. |
| Advisor (committee member) |
Bradforth, Stephen Shing, Katherine |
| Abstract | In Chapter 1, relatively well-defined end/pendent perfluorocarbon-functionalized Polystyrene–Poly(n-butylmethacrylate) (PS-PBMA) blends were prepared by ATRP and other synthetic methods to study the polymer self-assembly promoted by Fluorophilic Interactions (FI), which in theory can be treated as an extended instance of solvophobic effects in bulk state. Microscopic characterizations such as Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM) show micro-phase separated morphology with domains in the nanometer length scale for both type of polymer blends when a certain “critical perfluorocarbon concentration” is met, which is in principle supported by macroscopic characterizations such as DSC and optical clarity measurements. For the end-functionalized blends, lower polymer molecular weight and longer perfluorocarbon chain improve phase compatibility. Similarly for the pendent-functionalized blends, higher perfluorocarbon mole percentage generates more miscibility. However, possibly due to the excluded volume effect, the compatibilizing effect of perfluorocarbon end-groups is about 5-6 times higher than that of the perfluorocarbon pendent-groups. Qualitative “phase diagrams” for such perfluorocarbon mediated systems were constructed.; In Chapter 2, we applied the perfluorocarbon-mediated polymer self-assembly system to single-layer polymeric OLED devices. The EL spectra clearly indicated a highly efficient energy transfer process in the Rf-PPVO/(tpy)2Ir(acac)/Rf-PVK system and only partial energy transfer in the Rf-PPVO/(pq)2Ir(acac)Rf2/Rf-PTPA system. The device efficiency of the non RF emitter system is comparable to the corresponding conventional random copolymer system, suggesting the FI induced block copolymer like morphology is possibly a useful architecture for similar low-cost single-layer OLED devices. However, the devices with perfluorocarbon-functionalized emitters were generally rather poor in efficiencies. We speculate that this is due to the unfavorable emitter aggregation caused by FI. As a general nano material self-assembling technique, FI has great potentials in polymer-based opto-electronics research. |
| Keyword | polymer; self-assembly; perfluorocarbon; blend |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m2470 |
| Rights | Shen, Jingguo |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Shen-2757 |
| Archival file | uscthesesreloadpub_Volume17/etd-Shen-2757.pdf |
Description
| Title | Page 1 |
| Full text | PERFLUOROCARBON MEDIATED SELF-ASSEMBLY OF POLYMERS by Jingguo Shen A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (CHEMISTRY) August 2009 Copyright 2009 Jingguo Shen |
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