conventional blending of electrically conducting polymers

... morphology of the conducting backbone still plays an important role in determining the conductivity of these types of copolymers In summary, comparisons between the two series of copolymers demonstrated ... properties of the copolymers either The properties of the copolymers only improved after large amounts of ‘spacer’ units, 3alkylthiophenes, were introduced into the system The presence of these ... 1 Summary of the project As mentioned in Chapter 1, the aim of this project is to develop graft copolymers of polythiophene/poly(3-alkylthiophene) with commodity polymers like polystyrene...

Ngày tải lên: 16/09/2015, 17:11

... spectrum of copolymer The elemental content on the surface of the copolymers as analysed by XPS are listed in the table below: Table4.2 Copolymers 10 11 Summary of XPS elemental content of the copolymers ... the spectrum of copolymer 9, due to the lack of alkyl chains in this polymer The spectrum of copolymer can be distinguished from the spectra of the other three copolymers because of the peak at ... molecular weight of the thiophene unit = n Mw of thiophene 100% Mw of graft copolymer Where n = no of S element in the copolymer formula This gives an indication of the relative amount of polythiophene...

Ngày tải lên: 16/09/2015, 17:11

... conducting polymers with processable insulating compounds has been demonstrated to be an effective way to improve the processability of polymers [1a-d] Graft co-polymerisation of conducting polymers ... polymers is attracting much attention lately The advantage of this method over the physical blending of conducting polymers and commodity polymers is that long-term stability problems are avoided ... Fig 3.9 is the IR spectra of graft copolymers 4, and the blended copolymer Fig 3.9 IR spectra of copolymers 4, and the copolymer blend The spectra of the other six copolymers were quite similar...

Ngày tải lên: 16/09/2015, 17:11

... information of the polymers Fig 2.1 Overlaid FT-IR spectra of all monomers From top to bottom: THC4Br, THC6Br, THC8Br, THC10Br, and THC12Br 42 3.3 Physical properties of polymers The neutral polymers ... method of Casa et al has a similar degree of regioregularity compared to that of the Sugimoto approach [14] 47 Fig 2.3 NMR spectrum of pTHC6Br 48 3.5 Electrical conductivity of the doped polymers ... that of the bulk This may be a result of surface degradation of the functional group, which will be discussed in the later part of this section The surface elemental stoichiometries of the polymers...

Ngày tải lên: 16/09/2015, 17:11

... Table of Contents Summary List of schemes List of figures List of tables Chapter Introduction Overview of common conducting polymers 2 Brief introduction on the conducting mechanism Heterocyclic conducting ... Characterisation of Electrical Conducting Polymers/ co -polymers Based on -Functionalised 3-Alkylthiophenes Ma YiFei (B Sc (Hons.) NUS) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY OF SCIENCE ... characterisation of three series of novel electrical conducting polymers/ copolymers based on fuctionalised 3-alkylthiophene monomers The aim is to study the viability of grafting commodity polymers with...

Ngày tải lên: 16/09/2015, 17:13

... conducting polymers The applied aspects were organized covering the following subjects: the use of conducting polymers to minimize metallic corrosion, different points of view on the use of conducting ... Paramagnetic Centers in Conducting Polymers – Study by ESR and SQUID A.V Kulikov Institute of Problems of Chemical Physics, Russian Academy of Sciences, Russia Introduction Conducting polymers, viz., ... conducting polymers consist of fragments only in singlet or triplet state (no doublet satates) with wide distribution of the singlet-triplet splitting, and magnetic properties of conducting polymers...

Ngày tải lên: 29/06/2014, 09:20

... of Contents TABLE OF CONTENTS ACKNOWLEDGEMENTS TABLE OF CONTENTS STATEMENT OF RESEARCH PROBLEM SUMMARY LIST OF TABLE LIST OF FIGURES AND ILLUSTRATIONS LIST OF SYMBOLS AND ABBREVIATIONS LIST OF ... Development of Conducting Polymers Coatings 22 2.10 Conducting Polymer Coatings 23 2.10.1 Conducting Polymer Coatings on Metal Substrate 24 2.10.2 Electrodepostion of Conductive Polymers 25 2.10.3 ... analysis of the conducting polymers on the reactive metals since the presence of conducting polymers will also affect the electrical double layer at the metals surface There is another advantage of...

Ngày tải lên: 16/09/2015, 15:55

... Polymers 2.2.1 Structure and Synthesis 2.2.1.1 Polyaniline ii Table of Contents 2.2.1.2 Polypyrrole 2.2.2 Doping of Conducting Polymers 2.2.3 Degradation and Stability 2.2.4 Applications of Conducting ... units of several conducting polymers Among these conjugated polymers, polyaniline and polypyrrole are most extensively studied conductive polymers because of their interesting properties, ease of ... doping of different forms of polyaniline to the same conducting material Figure 3.1 Schematic diagram illustrating the process of Ar plasma treatment, grafting of VBC and viologen, and deposition of...

Ngày tải lên: 16/09/2015, 17:13

... therefore a measure of the degree of biodegradation Several test methods are based on measurement of the BOD, often expressed as a percentage of the theoretical oxygen demand (TOD) of the compound ... size of the polymer chain and the insoluble nature of many of the polymers Extracellular enzymes are responsible for this step, acting either endo (random cleavage on the internal linkages of the ... brief introduction about the most important mechanisms of polymer degradation 11.4.1 Nonbiological Degradation of Polymers A great number of polymers is subject to hydrolysis, such as polyesters,...

Ngày tải lên: 25/10/2013, 08:20

... outline of this work is as follows Section discusses the detection principle of the conducting polymer film and microwire sensors In Section 3, the fabrication of the conducting polymer microwires of ... microwires Conducting polymer micropatterns were generated using the ILL method [20–22] as follows (Fig 3): (i) a layer of multiple conducting polymer coatings and a layer of a non -conducting ... the layer of the material to be printed, while the substrate in the ILL approach involves an additional intermediate layer of a non -conducting polymer As a result of this difference, the conducting...

Ngày tải lên: 19/03/2014, 16:48

... Unlike simple molecules, polymers have a distribution of relaxation times This non-exponential nature of the relaxation functions of polymers has led to the development of many theories to model ... 3-D AFM image of a clean silicon wafer 49 Figure 5.4-3: AFM image of 40t sample after 10 hours of toluene wash 50 Figure 5.4-4: AFM image of 100t sample after 10 hours of toluene wash ... morphological behavior of polymer brush films Industrial use of thin films has increased for several reasons including the development of ever-smaller electronic devices As applications of polymers become...

Ngày tải lên: 23/03/2014, 01:20

Ngày tải lên: 24/04/2014, 17:24

... Introduction of Conducting Polymers physical mixture of insulating polymers with conducting fillers (e.g carbon or meter) [11] The differences of the conducting plastics from conducting polymers ... and to enhance mechanic strength of conducting polymers is needed Chapter Introduction of Conducting Polymers Figure 1.3 Molecular structure of typical conducting polymers (a) trans-polyacetylene; ... electrical properties of conducting polymers [7] On the other hand, -conjugated chain of conducting polymers leads to insoluble and poor mechanical properties of conducting polymers, limiting their...

Ngày tải lên: 04/06/2014, 14:43

... Figure Comparison of liposome and EP delivery of plasmid DNA Comparison of liposome and EP delivery of plasmid DNA Luciferase expression in mouse skin 48 hours after delivery of 100 μg gWizLuc ... of positive fields seen (eight fields per section and four sections per sample) The total amount of damage was determined for each sample and expressed as the mean and SEM of the percentage of ... Duration and levels of skin luciferase expression after delivFigure ery of plasmid by EP on days 0, 10, and 20 Duration and levels of skin luciferase expression after delivery of plasmid by EP on...

Ngày tải lên: 14/08/2014, 19:22

... Heeger, Alan MacDiarmid Shirakawa Hideki Câu chuyện 30 năm trước… Năm 1975, trường Tokyo Institute of Technology, tiến sĩ Shirakawa Hideki tổng hợp polyacetylene (PA) theo phương pháp thổi khí acetylene ... HNO3, H2SO4, HClO4, HF, HCl, FSO3H Halide kim loại chuyển tiếp Thí dụ: FeCl3, MoCl5, WCl5, SnCl4, MoF5 Họ amino, loại acid sinh học Thí dụ: glutamic acid, uridylic acid, protein, enzyme Các chất...

Ngày tải lên: 10/04/2015, 23:17

...  Organic polymers that conduct electricity are called conducting polymers Such compounds may have metallic conductivity or can be semiconductors The biggest advantage of conductive polymers is ... passing dry acetylene gas over ZieglerNatta catalyst of titanium tetrabutoxide triethyl aluminium in toluene at -78℃  It was obtained on the surface of the catalyst  And also in the two forms known ... (1) (2) Is cis polyacetylene Is trans polyacetylene The role of a dopant is to either add or remove electrons to the polymer  It is of two kinds:   (1) Oxidative or p-doping (2) Reductive or...

Ngày tải lên: 22/07/2015, 21:53

... graphs of (a) simple geometry of TEM system, (b) working principle of EDX 17  Figure 2.6: Schematic graphs of (a) working principle of UV-vis spectroscopy, (b) simple geometry of UV-vis ... quantitative determination of the composition of a material and depth profiling of individual elements [68] It has good sensitivity for heavy elements of the order of parts per million (ppm) ... 6  Figure 1.4: Schematic graphs of the (a) structure of DSC, (b) working principle of DSC 9  Figure 1.5: Schematic graphs of (a) working principle of semiconductor as electrode in...

Ngày tải lên: 10/09/2015, 09:12

... AND RHEOLOGY OF VESICLES AND POLYMERS CHIENG YU YUAN (B.Eng., M.Eng.(Hons.), Universiti Teknologi Malaysia) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMICAL AND ... enough to complete my research study i Table of Contents TABLE OF CONTENTS Page ACKNOWLEDGEMENTS i TABLE OF CONTENTS ii SUMMARY v LIST OF TABLES vii LIST OF FIGURES viii NOMENCLATURE xiii CHAPTER ... diameter of large unilamellar vesicles with addition of F-127 28 Figure 3.2 Size distribution of EPC vesicles with varying concentration of F-127 29 Figure 3.3 Hydrodynamic diameter of large...

Ngày tải lên: 11/09/2015, 09:57

... wt% of sirolimus Figure 6.11 Compression curve for stent from PCTOPD-27 with the thickness of 0.22 mm and out diameter of 3.45 mm x LIST OF TABLES Table 1.1 Comparison of the properties of SMPs ... Mechanism of Lipase-Catalyzed Polymerization of Cyclic Lactones Scheme 2.5 Production of PHAs Scheme 2.6 Representative Members of PHAs Scheme 2.7 Structure of Poly(3HB-co-3HV) Scheme 4.1 Synthesis of ... SYNTHESIS OF SHAPE-MEMORY POLYMERS FOR BIOMEDICAL APPLICATION XUE LIANG (Msc in Chemistry, Zhejiang University, China ) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHYLOSOPHY DEPARTMENT OF CHEMICAL...

Ngày tải lên: 11/09/2015, 09:58

... than hitherto possible in commercial polymers Molecular stiffness enables the precise placement and functional control of shape-persistent polymers Stiff polymers, combined with precise molecular ... interaction between theses groups is expected to help the self-assembly of the polymers The length of the alkyl chain and position of the alkyl chain on the mesogenic units appears to have significant ... self-assembly whereas the pyrimidine groups stabilized the self-assembly of jacketed polymers A series of novel jacketed liquid crystalline polymers, in which the terphenyl aromatic rigid core with alkyl...

Ngày tải lên: 16/09/2015, 17:11