Kinetic Analysis and Characterization of Epoxy Resins ... - FedOA

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Experimental 58 Figure 2.1: Schematic microwave oven structure. The waveguide has the function of transferring the energy from the point in which it is generated to the point in which it is used, avoiding considerable losses. It is produced in metallic material so the radiations travel through subsequent reflections. The waveguide has the length proportional to the frequency of the waves propagating within. A schematic representation of a waveguide is illustrated in Figure 2.2. Figure 2.2: Wave propagation in a rectangular waveguide. The applicator is the device used for the energy distribution on the workpiece. This is a structure expressly designed for the dielectric heating under microwave radiations. A good applicator carries out this task in an efficient, safe, reliable, repeatable and economic way. Generally the applicators can be subdivided in two categories 1. monomodal; 2. multimodal. 58
Experimental 59 In monomodal applicators, at least one of their dimensions is of the order of the wave length, propagating within. For this reason the field conformation is well determined and relatively little influenced by the presence of the workpiece to heat. While multimodal applicators are “box” with metallic walls much larger than the wave length used for the radiations. A schematic representation of a multimodal applicator is shown in Figure 2.3. Figure 2.3: Multimodal applicator. This structure is a resonant cavity, in which there are a lot of propagation modes and therefore the overlap of numerous waves, moving in different directions. This phenomenon is due to multiple reflections from the metallic walls. The introduction of a mode stirrer, formed by moving metallic surfaces, and the movement of the workpiece, improves the dielectric heating uniformity. In the microwave plant used in this work there is a mode stirrer and the sample can be submitted to an alternating forward and backward movement. The microwave oven is provided of a system, that links together the waveguide with a monomodal applicator, both inserted in a multimodal cavity. This particular combination has been carried out for satisfying the features, required by the 59
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UNIVERSITA’ DEGLI STUDI DI NAPOLI
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3 I thank all the lecturers of PhD
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5 Microwaves are electromagnetic ra
Page 7 and 8: CONTENTS 7 1.8.1 DielectricProperti
Page 9 and 10: CONTENTS 9 4 Conclusions and Outloo
Page 11 and 12: LIST OF TABLES 11 3.2 Average value
Page 13 and 14: List of Figures 1.1 Diglycidylether
Page 15 and 16: LIST OF FIGURES 15 2.23 Onset tempe
Page 17 and 18: LIST OF FIGURES 17 3.38 Comparison
Page 19 and 20: Introduction 19 cannot be melted an
Page 21 and 22: Introduction 21 • bismaleimides;
Page 23 and 24: Introduction 23 cold solders, casti
Page 25 and 26: Introduction 25 Average Properties
Page 27 and 28: Introduction 27 In Figure 1.4 n can
Page 29 and 30: Introduction 29 ducts and it genera
Page 31 and 32: Introduction 31 tween current-carry
Page 33 and 34: Introduction 33 that describe the p
Page 35 and 36: Introduction 35 1.3.5 Lorentz Force
Page 37 and 38: Introduction 37 Figure 1.11: Electr
Page 39 and 40: Introduction 39 Even microwaves can
Page 41 and 42: Introduction 41 production requirem
Page 43 and 44: Introduction 43 fect of the electro
Page 45 and 46: Introduction 45 following different
Page 47 and 48: Introduction 47 Debye equations bas
Page 49 and 50: Introduction 49 Although these mode
Page 51 and 52: Introduction 51 materials that have
Page 53 and 54: Chapter 2 Experimental In this chap
Page 55 and 56: Experimental 55 Characteristic Note
Page 57: Experimental 57 If the oven is used
Page 61 and 62: Experimental 61 Figure 2.5: Right s
Page 63 and 64: Experimental 63 Figure 2.8: Front v
Page 65 and 66: Experimental 65 regardless of the a
Page 67 and 68: Experimental 67 • The number of t
Page 69 and 70: Experimental 69 Figure 2.11: Surfac
Page 71 and 72: Experimental 71 Figure 2.12: Repeti
Page 73 and 74: Experimental 73 From the Figure 2.1
Page 75 and 76: Experimental 75 in the centre of th
Page 77 and 78: Experimental 77 not read the water
Page 79 and 80: Experimental 79 Test number 1 2 3 4
Page 81 and 82: Experimental 81 Figure 2.19: Plot o
Page 83 and 84: Experimental 83 2.5 Datalogger This
Page 85 and 86: Experimental 85 same reason a wood
Page 87 and 88: Experimental 87 Material Behaviour
Page 89 and 90: Experimental 89 in function of the
Page 91 and 92: Experimental 91 2.6.3 Influence of
Page 93 and 94: Chapter 3 Results and Discussion Th
Page 95 and 96: Results and Discussion 95 There is
Page 97 and 98: Results and Discussion 97 Figure 3.
Page 99 and 100: Results and Discussion 99 Parameter
Page 101 and 102: Results and Discussion 101 After pr
Page 103 and 104: Results and Discussion 103 of insta
Page 105 and 106: Results and Discussion 105 1. Mecha
Page 107 and 108: Results and Discussion 107 where k
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Results and Discussion 109 Kinetic
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Results and Discussion 111 Figure 3
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Results and Discussion 113 3.3 Comp
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Results and Discussion 115 pedestal
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Results and Discussion 117 Tables 3
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Results and Discussion 123 t MW [s]
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Results and Discussion 125 simulate
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Results and Discussion 129 t DSC [s
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Results and Discussion 133 Using th
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Results and Discussion 135 forward
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Results and Discussion 141 than the
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Results and Discussion 143 Since ev
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Results and Discussion 145 ditions.
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Results and Discussion 147 3.23 and
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Results and Discussion 149 The T g
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Results and Discussion 151 3.6.1 St
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Results and Discussion 153 Flexural
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Results and Discussion 155 3.7.2 FT
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Results and Discussion 157 identifi
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Results and Discussion 159 This eff
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Results and Discussion 161 Also in
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Conclusions and Outlook 163 degree
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Appendix A A Brief History of Micro
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A Brief History of Microwave Oven 1
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Bibliography [1] W. Callister, “M
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BIBLIOGRAPHY 171 [19] P. I. Karkana
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BIBLIOGRAPHY 173 [34] K. D. V. Pras
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Kinetic Analysis and Characterization of Epoxy Resins ... - FedOA

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