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

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Results and Discussion 154 Figure 3.41: EC 57 FT-IR spectrum. cm −1 of the epoxy system microwave cured is illustrated. Figure 3.42: Zoom of FT-IR spectrum of an epoxy sample microwave cured. No peaks corresponding to epoxy group can be observed in the wavenumber region of 916 cm −1 . 154
Results and Discussion 155 3.7.2 FT-NIR Spectra The spectroscopic analysis has been extended also to near infrared region 22 for verifying the disappearance of the peak corresponding to primary amino group at about 4930 cm −1 . In Figure 3.43 the FT-NIR spectrum of the hardener agent K 21 is illustrated. Figure 3.43: K 21 FT-NIR spectrum between 4000 and 6000 cm −1 . Finally in Figure 3.44 a comparison of the FT-NIR spectra of the epoxy system microwave and conventionally cured is shown. The two FT-NIR signals are very similar, and no peaks are present in the region around 4930 cm −1 . Therefore it is not possible to relate the observed behaviour to differences in fractional conversion or reaction path possibly induced by the use of microwave radiations. No residual reagents, epoxies or amines, can be found in samples cured in both the way. Therefore a complete conversion has been reached, and the absence of homopolymerization reactions has been also verified. 22 Wavenumber between 4000 and 1000 cm −1 . 155
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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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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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