SUPERCRITICAL FLUID MEDIATED SYNTHESIS OF POLYMERS AND POLYMERIC NANOMATERIALS
- Alternative Title
- 고분자와 고분자성 나노구조물의 중합 매개제인 초임계유체
- Abstract
- Supercritical carbon dioxide (scCO₂) can be advantageously used as a "green solvent" for various processes over the traditional organic and aqueous solvents. We report here the free radical dispersion polymerization of methyl methacrylate (MMA) and styrene (St) in scCO₂. In this process we used novel copolymeric surfactants, 1H,1H-perfluorooctyl methacrylate and 2-dimethylaminoethyl methacrylate, poly(FOMA-co-DMAEMA) and 3-(tris(trimethylsilyloxy)silyl) propyl methacrylate and 2-dimethylaminoethyl methacrylate, poly(SiMA-co-DMAEMA) for stabilizing the monomer dispersion in scCO₂. Detail study on the effect of copolymer composition, stabilizer and monomer concentrations, and the initial medium pressure upon polymerization yield, molar mass and morphology of PMMA or PS were investigated. In another set of experiments, we also synthesized conducting polymer and inorganic filler nanocomposites in scCO₂. Inorganic fillers (TiO₂, SiO₂, Fe₂O₃ and CNT) were first surface modified with 3-(trimethoxysilyl) propyl methacrylate (MPS) in order to disperse well in CO₂ and then an in-situ polymerization of monomer was carried out in the presence of fillers in scCO₂. The resulting nanocomposites were characterized by FT-IR spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy X-ray diffraction studies (XRD), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS).
- Issued Date
- 2008
- Awarded Date
- 2008. 8
- Type
- Dissertation
- Keyword
- 초임계 이산화탄소 청정용매 고분자와 고분자성 나노구조물의 중합 매개제 초임계유체
- Publisher
- 부경대학교 대학원
- Affiliation
- 부경대학교 대학원
- Department
- 대학원 이미지시스템공학과
- Table Of Contents
- CHAPTER 1 INTRODUCTION = 1
1.1 BACKGROUND ON SUPERCRITICAL CARBON DIOXIDE = 2
1.2 PHYSICAL & CHEMICAL PROPERTIES OF SUPERCRITICAL CO2 = 4
1.3 DISPERSION POLYMERIZATION = 9
1.4 CONDUCTING POLYMER NANOCOMPOSITES = 21
1.5 CARBON NANOTUBE COMPOSITES = 25
1.6 REFERENCES = 29
CHAPTER 2 Dispersion Polymerization of MMA in Supercritical Carbon dioxide = 39
2.1 INTRODUCTION = 40
2.2 EXPERIMENTAL SECTION = 43
2.2.1 MATERIALS = 43
2.2.2 PREPARATION OF STABILIZERS = 43
2.2.3 DISPERSION POLYMERIZATION = 46
2.2.4 POLYMER CHARACTERIZATION = 46
2.2.5 DETERMINATION OF CLOUD POINT = 47
2.2.6 FORMATION OF AQUEOUS LATEXES = 47
2.3 RESULTS AND DISCUSSION = 48
2.3.1 USING SEMI-FLUORINATED RANDOM COPOLYMERS = 48
2.3.2 USING NON-FLUOROUS RANDOM COPOLYMERS = 66
2.4 CONCLUSIONS = 80
2.5 REFERENCES = 81
CHAPTER 3 Synthesis of Polystyrene Particles in Supercritical Carbon Dioxide = 85
3.1 INTRODUCTION = 86
3.2 EXPERIMENTAL SECTION = 89
3.2.1 MATERIALS = 89
3.2.2 PREPARATION OF RANDOM COPOLYMERS = 90
3.2.3 DISPERSION POLYMERIZATION OF STYRENE IN scCO2 = 90
3.2.4 SORPTION OF CO2 BY HOMOPOLYMERS = 91
3.2.5 CHARACTERIZATION = 92
3.3 RESULTS AND DISCUSSION = 93
3.3.1 USING SEMI-FLUORINATED RANDOM COPOLYMERS = 93
3.3.2 USING NON-FLUOROUS RANDOM COPOLYMERS = 106
3.4 CONCLUSIONS = 118
3.5 REFERENCES = 119
CHAPTER 4 Synthesis of Conducting Polymer/Inorganic Oxide Nanocomposites = 121
4.1 INTRODUCTION = 123
4.2 EXPERIMENTAL SECTION = 125
4.2.1 MATERIALS = 125
4.2.2 GRAFTING OF MPS ONTO INORGANIC OXIDE NANOP- = 126
4.2.3 SYNTHEIS OF NANOCOMPOSITES IN scCO2 = 126
4.2.4 CHARACTERIZATION = 126
4.3 RESULTS AND DISCUSSION = 127
4.3.1 POLYPYRROLE/TiO2 NANOCOMPOSITES = 127
4.3.2 POLYPYRROLE/γ-Fe2O3 NANOCOMPOSITES = 133
4.3.3 POLYPYRROLE/SiO2 NANOCOMPOSITES = 145
4.4 CONCLUSIONS = 153
4.5 REFERENCES = 153
CHAPTER 5 Synthesis of Polypyrrole/MWNT Composites in Supercritical Fluid = 156
5.1 INTRODUCTION = 158
5.2 EXPERIMENTAL SECTION = 160
5.2.1 MATERIALS = 160
5.2.2 SURFACE MODIFICATION OF MWNTs = 161
5.2.3 SYNTHESIS OF PPy/MWNT COMPOSITES = 161
5.2.4 CHARACTERIZATION = 162
5.3 RESULTS AND DISCUSSION = 162
5.4 CONCLUSIONS = 171
5.5 REFERENCES = 172
SUMMARY = 175
PUBLICATIONS = 179
PATENTS = 183
INTERNATIONAL CONFERENCES-PROCEEDINGS = 184
- Degree
- Doctor
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