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

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Results and Discussion 156 Figure 3.44: Comparison of FT-NIR spectra in the region between 4000 and 6000 cm −1 . 3.8 Sensitizers A preliminary investigation about the influence of suitable microwave sensitizers on the heating rate and thermal profile of the epoxy system has been carried out. 3.8.1 Organic oligomers A low molecular weight organic compound sensitive to electromagnetic field and completely miscible with the epoxy mixture 23 has been identified, after an introductive chemistry research. The amount to add to the epoxy system must be carefully selected. In fact an excessive amount interferes with the curing process, avoiding the formation of the 3-D epoxy network. While a too small amount is not sufficient to activate the sensitizing effect. After a preliminary optimization, the quantity of about 2 p.h.r. has been 23 The exact denomination has been omitted for enabling a possible patent. 156
Results and Discussion 157 identified as the best weight percentage. The epoxy mixture containing about 2 p.h.r. of this organic sensitizer has been prepared according to the procedure illustrated in the section 2.1.3 on page 54. The components quantity used in these experiments are listed in Table 3.29. The system has been submitted to a microwave curing process in the oven, working as a static cavity, and selecting the oven parameters reported in Table 3.30. These parameters allow the complete conversion of the epoxy mixture free from additives, as verified through the experiments presented in the section 3.9 on page 116. Components Amount of Epoxy Mixture Containing the Organic Sensitizer EC 57 ≈ 3 K21 ≈ 0, 6 Organic Sensitizer ≈ 0, 07 Table 3.29: Quantity of the components of the epoxy mixture used for experiments with the organic sensitizer. Parameters Tray movement MW radiation time Irradiated power Tray velocity IR heating Air temperature Value OFF 175 s 1500 W 224 cm/min OFF 25 ◦ C Table 3.30: Microwave oven parameters used for the experiments with the sensitizers. 157
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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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Results and Discussion 95 There is
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Results and Discussion 97 Figure 3.
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Results and Discussion 99 Parameter
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Results and Discussion 101 After pr
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Results and Discussion 103 of insta
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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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