Well-defined Copolymers for Individual Dispersion of Single-walled Carbon Nanotube with High Aspect Ratio = 고분자를 이용한 저결함 높은 종횡비의 단일벽 탄소 나노 튜브의 분산

다국어 초록 (Multilingual Abstract)

This dissertation describes the synthesis of polymers for individual dispersion of single-walled
carbon nanotubes (SWCNTs) with high aspect ratio. In contrast to small molecular surfactants,
polymeric dispersants require soft external force to exfoliate SWCNTs which results in SWCNTs
with low defects and high aspect ratio. Thus, it is of great importance to optimize polymer
structure for SWCNT dispersion by selecting monomers, controlling composition and topologies.
Well-defined polymeric dispersants are synthesized by atom transfer radical polymerization. The
polymeric dispersants are composed of furfuryl methacrylate (FMA), anchoring group interacting
with SWCNT surface and 2-(dimethylamino)ethyl methacrylate (DMAEMA) or quaternized
QDMAEMA (QDMAEMA) as a stabilizer group for solubilizing SWCNT in mediates. The
copolymers are characterized by GPC and 1H NMR for molecular weight, polydispersity index,
and composition.
The dispersion solutions of SWCNT with synthesized polymers are analyzed the dispersion
stability and dispersibility by particle stability analyzer, UV-Vis-NIR spectroscopy, TEM, AFM,
Raman spectroscopy and XPS. The mechanism for individual dispersion of SWCNTs has also
been proposed to understand the role of polymeric dispersants. The individually dispersed
SWCNTs preserving the own length and surface structure have potential for electrical devices, in
particular transparent conductive films (TCFs). TCFs were fabricated and evaluated for flexible
touch panel screen

목차 (Table of Contents)

• Chapter 1. General Introduction 1
• 1.1 General introduction 2
• 1.2 References . 3
• Chapter 2. Theoretical Background . 8
• 2.1 Carbon nanotube 9
• 2.1.1 Structure. 9
• 2.1.2 Properties . 14
• 2.2 Dispersion of carbon nanotubes 16
• 2.2.1 Covalent functionalization of carbon nanotubes 17
• 2.2.2 Non-covalent functionalization of carbon nanotubes 17
• 2.2.2.1 CNTs dispersion by surfactants 18
• 2.2.2.2 CNTs dispersion by polymeric dispersants 20
• 2.3 Synthesis of well-defined polymeric dispersants . 22
• 2.4 References . 24
• Chapter 3. The Effect of Composition of Polymers on Dispersion of Single-walled
• Carbon Nanotubes . 33
• 3.1 Introduction 34
• 3.2 Experimental 35
• 3.2.1 Materials. 35
• 3.2.2 Instruments 35
• 3.2.3 Synthesis of p(FMA-co-DMAEMA) . 36
• 3.2.4 Quarternery ammonium modification of p(FMA-co-DMAEMA) 36
• 3.2.5 Dispersions of SWCNTs using the polymeric dispersant 37
• 3.3 Results & Discussion 37
• 3.3.1 Design and characterization of polymeric dispersants 37
• 3.3.2 Characterization of the SWCNT dispersion . 41
• 3.4 Conclusion . 54
• 3.5 References . 54
• Chapter 4. The Dispersion and Evaluation of Single-walled Carbon Nanotubes
• Dispersion by Polymer Wrapping 58
• 4.1 Introduction 59
• 4.2 Experimental 60
• 4.2.1 Materials. 60
• 4.2.2 Instruments 60
• 4.2.3 Synthesis of polymeric dispersants 61
• 4.2.4 Dispersion of HiPco-SWCNTs using polymeric dispersants . 61
• 4.3 Results & Discussion 62
• 4.2.2 Synthesis of polymeric dispersants 62
• 4.2.3 Characterization of dispersed SWCNTs . 62
• 4.4 Conclusion . 75
• 4.5 References . 75
• Chapter 5. Non-Destructed SWCNT Dispersion with High Aspect Ratio and
• Fabrication of Transparent Conductive Films . 79
• 5.1 Introduction 80
• 5.2 Experimental 81
• 5.2.1 Materials. 81
• 5.2.2 Instruments 82
• 5.2.3 Synthesis of furfuryl alcohol . 83
• 5.2.4 Synthesis of furfuryl methacrylate (FMA) 83
• 5.2.5 Synthesis of p(FMA-co-DMAEMA) . 83
• 5.2.6 Dispersion of SWCNTs using the polymeric dispersants 84
• 5.2.7 Fabrication of transparent conductive films 84
• 5.3 Results and discussion . 86
• 5.3.1 Synthesis of polymeric dispersants 86
• 5.3.2 Characterization of the SWCNTs dispersion . 90
• 5.3.3 Design and characterization of polymeric dispersants 92
• 5.3.4 Characterization of the TCFs . 95
• 5.4 Conclusion . 106
• 5.5 References . 106
• Chapter 6. Summary . 112
• 6.1 Summary . 113
• APPENDIX . 115