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

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Results and Discussion 146 MW Oven Parameters Tray movement MW radiation time Irradiated power Tray velocity IR heating Air temperature ON 450 s (30 passages under waveguide) 1500 W 224 cm/min OFF 25 ◦ C Table 3.23: Parameters of the MW cycle. Epoxy Reactants Quantity EC 57 K 21 66 g 13,20 g Weight ratio 5/1 Table 3.24: Quantity of epoxy components used during the MW cycle. Figure 3.37: DSC Dynamic scan of epoxy resin microwave cured for DMA. 146
Results and Discussion 147 3.23 and 3.24 a right curing process has been performed. 3.5.1 Storage Modulus A comparison of the storage modulus between samples thermally and microwave cured has been carried out. The DMA test have been performed using the parameters listed in Table 3.25. In Figure 3.38 a comparison of storage modulus between samples conventionally DMA Parameters Clamp Frequency Temperature range Heating rate Single Cantilever 1 Hz from –30 to 220 ◦ C 5 ◦ C/min Table 3.25: DMA parameters. and microwave cured is illustrated. At room temperature the storage modulus of samples microwave crosslinked is much higher than that of samples thermally cured. 3.5.2 Glass Transition Temperature Another parameter investigated during DMA test is the glass transition temperature, measured as abscissa of the signal in a plot of tanδ against temperature. Improving T g is a desirable feature for development of efficient and alternative mould materials. In Figure 3.39 a comparison of T g between samples conventionally and microwave polymerized is shown. 147
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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
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CONTENTS 7 1.8.1 DielectricProperti
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CONTENTS 9 4 Conclusions and Outloo
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LIST OF TABLES 11 3.2 Average value
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List of Figures 1.1 Diglycidylether
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LIST OF FIGURES 15 2.23 Onset tempe
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LIST OF FIGURES 17 3.38 Comparison
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Introduction 19 cannot be melted an
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Introduction 21 • bismaleimides;
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Introduction 23 cold solders, casti
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Introduction 25 Average Properties
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Introduction 27 In Figure 1.4 n can
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Introduction 29 ducts and it genera
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Introduction 31 tween current-carry
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Introduction 33 that describe the p
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Introduction 35 1.3.5 Lorentz Force
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Introduction 37 Figure 1.11: Electr
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Introduction 39 Even microwaves can
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Introduction 41 production requirem
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Introduction 43 fect of the electro
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Introduction 45 following different
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Introduction 47 Debye equations bas
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Introduction 49 Although these mode
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Introduction 51 materials that have
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Chapter 2 Experimental In this chap
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Experimental 55 Characteristic Note
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Experimental 57 If the oven is used
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Experimental 59 In monomodal applic
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Experimental 61 Figure 2.5: Right s
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Experimental 63 Figure 2.8: Front v
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Experimental 65 regardless of the a
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Experimental 67 • The number of t
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Experimental 69 Figure 2.11: Surfac
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Experimental 71 Figure 2.12: Repeti
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Experimental 73 From the Figure 2.1
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Experimental 75 in the centre of th
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Experimental 77 not read the water
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Experimental 79 Test number 1 2 3 4
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Experimental 81 Figure 2.19: Plot o
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Experimental 83 2.5 Datalogger This
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Experimental 85 same reason a wood
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Experimental 87 Material Behaviour
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Experimental 89 in function of the
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Experimental 91 2.6.3 Influence of
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Chapter 3 Results and Discussion Th
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Page 117 and 118: Results and Discussion 117 Tables 3
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Page 145: Results and Discussion 145 ditions.
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Page 161 and 162: Results and Discussion 161 Also in
Page 163 and 164: Conclusions and Outlook 163 degree
Page 165 and 166: Appendix A A Brief History of Micro
Page 167 and 168: A Brief History of Microwave Oven 1
Page 169 and 170: Bibliography [1] W. Callister, “M
Page 171 and 172: BIBLIOGRAPHY 171 [19] P. I. Karkana
Page 173: BIBLIOGRAPHY 173 [34] K. D. V. Pras
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Kinetic Analysis and Characterization of Epoxy Resins ... - FedOA

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