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  • 封面
    英文文摘
    学位论文数据集
    CHAPTER 1 INTRODUCTION
    1.1. SURFACE MODIFICATION OF MWCNT BY OXIDATIVE POLYMERIZATION OF DOPAMINE
    1.2. SURFACE MODIFICATION BY PLASMA POLYMERIZATION OF GLYCIDYL METHACRYLATE (GMA) ON CNT AND ITS NANOCOMPOSITES
    1.3. MWCNT/SILICONE RUBBER NANOCOMPOSITES
    CHAPTER 2 LITERATURE REVIEW
    2.1. CARBON NANOTUBES
    2.1.1. Structure
    2.1.2. Physical Properties
    2.1.3. Electrical properties
    2.1.4. Applications
    2.2. COATING MATERIALS
    2.2.1. Chemical Purity
    2.2.2. Physical Properties
    2.2.3. Process Suitability
    2.3. CHEMISTRY AND PROPERTIES OF SOME POLYMER COATINGS
    2.3.1. Epoxies
    2.3.2. Silicones
    2.3.3. Dopamine
    2.4. MANUFACTURING TECHNOLOGIES
    2.4.1. Masking
    2.4.2. Cleaning
    2.4.3. Preparation of coating
    2.5. PLASMA POLYMERIZATION
    2.5.1. Domains of plasma polymerization
    2.5.2. Mass balance and deposition rate in a plasma polymerization system
    2.5.3. Effect of the frequency on plasma polymerization
    2.5.4. Introduction to polymer surface modification
    2.5.5. Surface Treatment Effects of Plasma on Polymers
    2.5.6. Surface Functionalization
    2.5.7. Advantages and disadvantages of using plasma polymerized
    2.6. SILICONE RUBBER
    2.6.1. Structure and Chemistry
    2.6.2. Industrial Classifications
    2.6.3. Curing Additives
    2.6.4. Manufacture
    2.6.5. Liquid Silicone Rubbers
    2.6.6. Rubber crystallization
    2.6.7. Vulcanization
    2.6.8. Crystallization
    2.6.9. Room Temperature Vulcanising (RTV) Rubbers
    2.6.10. Silicone elastomers
    2.6.11. Properties
    2.7. PROCESSING AND MANIPULATION
    2.7.1 Covalent Method
    2.7.2 Noncovalent Method
    2.8. CARBON NANOTUBES INDUCED SILICONE RUBBER CRYSTALLIZATION
    2.8.1. Silicone rubber crystallization
    2.8.2. Objectives
    CHAPTER 3 SURFACE FUNCTIONALIZATION OF MWNTS BY DOPAMINE OXIDATIVE POLYMERIZATION
    3.1. EXPERIMENTAL SECTION
    3.1.1. Materials
    3.1.2. Scanning Electron Microscopy (SEM)
    3.1.3. EDX analysis
    3.1.4. Fourier Transform Infra Red (FT-IR)
    3.1.5. X-ray photoelectron spectroscopy (XPS)
    3.1.6. Transmission Electron Microscopy (TEM)
    3.2. RESULTS AND DISCUSSION
    3.2.1. Morphological structure
    3.2.2. Surface elemental determined
    3.2.3. FT-IR analysis
    3.2.4. Comparative study by FTIR
    3.2.5. X-ray photoelectron spectroscopy analysis
    3.3. SUMMARY
    CHAPTER 4 SURFACE MODIFICATION BY PLASMA POLYMERIZATION OF GLYCIDYL METHACRYLATE ON MWCNT AND ITS NANOCOMPOSITES
    4.1. EXPERIMENTAL SECTION
    4.1.1. Samples preparation
    4.1.2. Plasma polymerization characterization
    4.1.3. Surface Characterization
    4.1.4. Fourrier Transform Infrared (FTIR)
    4.2. EFFECTS OF PP-GMA ON CNT
    4.2.1 Experimental section
    4.2.2. Effect of plasma pretreatment on the surface of CNT substrate
    4.2.3. Composition of PP-GMA on the CNT surfaces: the PP-GMA-CNT surfaces
    4.2.4. FT-IR spectra characterization
    4.2.5. X-ray photoelectron spectroscopy (XPS)
    4.3. PREPARATION OF PP-GMA/SILICON NANOCOMPOSITES
    4.3.1 Experimental
    4.3.2 .Attenuated total reflection- Fourier Transform infrared (ATR-FT-IR)
    4.3.3. Thermo gravimetric analysis (TGA)
    4.3.4. Differential scanning electron (DSC)
    4.3.5. Scanning electron microscopy (SEM)
    4.4. SUMMARY
    CHAPTER 5 MULTI-WALLED CARBON NANOTUBESlSlLICONE RUBBER NANOCOMPOSITES PREPARED BY HIGH SHEAR MECHANICAL MIXING
    5.1. MATERIALS AND METHODS
    5.1.1. Materials
    5.2. CHARACTERIZATION METHODS
    5.2.1. Mechanical properties
    5.2.2. Dynamic mechanical thermal Analysis
    5.2.3. Thermal conductivity
    5.2.4. Electrical conductivity
    5.2.5. Differential scanning calorimetric (DSC)
    5.2.6. Thermo gravimetric analysis (TGA)
    5.2.7. Scanning electron microscope (SEM)
    5.2.8 Thermal Analysis
    5.3. RESULTS AND DISCUSSIONS
    5.3.1. Mechanical properties
    5.3.2 Young' Modulus change of CNT/SiR composites
    5.3.3 Dynamical mechanical Analysis
    5.3.4. Thermo gravimetric analysis of CNT/SiR composites
    5.3.5. Thermal stability of CNT/SiR composites
    5.3.6 Thermal conductivity of CNT/SiR composites
    5.3.7. Crystallization behavior of CNT/SiR nanocomposites
    5.3.8. Scanning Electron Microscopy (SEM) observation
    5.3.9. Electrical Conductivity
    5.4. GROWTH FUNCTIONALITY
    5.4.1 Crystallization Temperature Effect
    5.4.2. CNT concentration effects
    5.4.3. Molecular Weight Effect
    5.5. SUMMARY
    CHAPTER 6 CONCLUSIONS
    CHAPTER 7 LIST OF REFERENCES
    Research achlevement and publications
    Acknowledgements
    Brief introduction on author
    Brief introduction on the supervisor
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DOI:10.7666/d.Y1878267

Surface modification of Multi-walled carbon Nanotubes

Aloys Katihabwa
北京化工大学
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The first reported observation of carbon nanotubes was by Iijima in 1991 for multi-wallcarbon nanotubes (MWCNT). It took however, less than two years before single wall carbonnanotubes were discovered experimentally by Iijima at the NEC Research Laboratory inJapan and by Bethune at the IBM Almaden Laboratory in California These experimentaldiscoveries and the theoretical work which predicted many remarkablc properties for carbonnanotubes, launched this field and propelled it forward. The field has been advancing at abreath taking pace ever since with many unexpected discoveries.Caron Nanotubes (CNT)have attracted tremendous attention and numorous potential applications have been proposed.CNTs are among the stiffest and strongest materials known, and have remarkable electronicproperties and many other unique characteristics. For these reasons, they have attracted lotsof academic and industrial interest, with thousands of papers on nanotubes being publishedevery year.　　 In the first part of this thesis, Surface modification of Carbon nanotubes by a reactivebiopolymer- polydopamine (pdop) was conducted by dispersing CNTs into a solution ofdopamine and mildly stirred at room temperature. Modifying the outer of carbon nanotubes(CNTs) is a promising pathway to manipulate them into solutions, hybrid assemblies andnano-devices. Although, success have been achieved in many areas, many available methodshave limitations for widespread practical use; specific examples include the drastic reactionconditions and breakdowns of CNT sidewalls (oxidative acid treatmcnt), the use of complexinstrumentation and multistep procedures (covalent grafting in organic solvent), thelimitations of coating thickness (deposition of proteins etc.) reactivity and bioactivity(semiconductors). The surface modification doesn't ruin the nanotube sidewalls, and itsthickness was controlled on nanometer by adjusting the reaction time, temperature and pH.Furthcrmore, the coating was a vc:rsatilc platform for functional organic ad-layers Theresulted coating is a versatile platfonn for both functional organic ad layax Furthermore, alayer film constmction of silverloaded nanotubes has also achieved. The dispersed andcovered nanotubes were investigated by scanning-Electron Microscopy (SEM),Transmission Electron Microscopy, Fourier-Transmission Infrared (FT-IR), and X-rayPhotoelectron spectroscopy (XPS) in order to analyze the evolution of the dispersion and thesurface modification of MWCNT. Silver nanoparticle modified carbort nanotubes pasteelectrodes for determination of Dopamine has been extensively studied and variousapproaches have been employed for the preparation of metal nanoparticlcs. Therefore, muchwork has been caITied out into their formation characterization and employment fordetection of many electro actives species. Therefore, modification of Carbon nanotubes byoxidative polymerization of dopamine, including Silver has to be improved.　　 Secondly, Plasma polymerization is a procedure, in which gaseous monomers,stimulated through plasma, condense on freely selectable substrates as high cross-linkedlayers． As the monomer molecules in plasma for the most part become shattered intoreactive particles, there remain at most only partially preserved chemical structures of theoutput gases in the product, which results in cross-linked and disordered structure. Swcturalpreservation and cross-linking gradients can bc controlled through process parameters suchas pressure, working gas-flow and applied electrical output; so that one can also construct socalled gradient layers； with increasing degree of cross-linking over the thickness. In thisthesis, thin polymer films were deposited on CNT surface by plasma polymerization of GMA(Glycidyl methacrylate) under different glow discharge condition. The FT-IR, X-rayphotoelectron spectroscopy (XPS) and gases carricr plasma(oxygen, (O2); Nitronium (N2)and Argon(Ar)) treatment results; suggested that the epoxide functional group8 0f thedeposited film httd been preserved to various extends depending on the plasma depositionconditions The use of low radio frequency power (～80W) and a relatively low systempressure 0.6torr readily resulted in the deposition of thin film having nearly the samecomposition of the epoxide functional groups as that of the GMA homopolymer. The plasmapolymerization of GMA (PP-GMA) thin film deposited on the Ar, O2, N2 pretreated CNTsurface, were retained to a large extend, suggesting the presence of covalent bonding betweenthe PP-GMA layer and the CNT surface. In the present work, GMA is plasma polymerized(PP-GMA) and deposited on the plasma pretreaterd Carbon Nanotubes (CNT) surface withthe preservation of a high percentage of the epoxide groups. The plasma polymerized of GMA also pretreated silicon nanocomposites in order to study the surface modification, thechemical change and the effect of the plasma polymer of GMA on the CNT/Silicon. FT-IR,DSC, TGA, SEM and FTIR-ATR were conducted and the structure of the silicon waschemically modified by the plasma polymerization of Glycidyl methacrylate. Therefore,Fourier transform infrared spectroscopy - attenuated total reflectance (FTIR-ATR) hasproven to be a useful technique for the analysis of surfactants on the surface of silicone andppGMA films　　 Thirdly, Multi-wall carbon nanotubes (MWCNT) reinforced silicone rubber (SiR)nanocomposites were successfully prepared through mechanical mixing method usingdicumyl peroxide (DCP) as a curing agent. The vulcanization reaction of the elastomer ispromoted by the radical decomposition of DCP to obtain the network structure. Themcchanical propcrties of the nanocomposite:s were evaluated. The thermal stability of thenanocomposites was systematically studied.Measurcments are used primarily to determinethe amount and rate of change in the weight of a material as a function of temperature, andcharactcrizc materials that exhibit weight loss or gain due to decomposition. The dispersionof CNTs in silicone rubber was characterized by Scanning electron Microscopy (SEM).　　 Finally, the effect of carbon nanotubes loading on the elcctrical thermal conductivityand Payne effcct were also investigated Furthermore, From DSC study, it has beendetermined that the degree of crystallinity Xc and the super cooling △T, generallycharacterize the crystallization behavior of the nanocomposites.A decrease in Xc and △Tindicate that the crystallization rate of the nanocomposites is increased. Afier pyrolysis,with the increase of CNT content, the decomposition rate or/and the weight loss of thenanocomposites decreased.

carbon nanotubes;surface modification;elastomer;nanocomposites

北京化工大学

博士

Material Science and Engineering

Liqun Zhang

2010

中文

TB383;TQ127.1

146

2011-08-24（万方平台首次上网日期，不代表论文的发表时间）

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