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

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Results and Discussion 122 Figure 3.19: Standard DSC dynamic scan at 10 ◦ C/minonanindiumsample. values, measured with the same DSC instrument operating at these two different heating rate. For this reason the data obtained using the DSC at these elevated heating rates can be considered affected by an error at most equal to the 5%. The fractional degree of conversion after every partial microwave cure process has been calculated using equation 3.21: α =1− ∆H RES ∆H TOT (3.21) where ∆H RES are the values reported in Tables 3.11 and 3.12, while ∆H TOT is equal to 485 J/g, that is the average value of total cure energy, measured through dynamic scan at different heating rate, as reported in Table 3.2. In Table 3.13 the degree of cure versus reaction time, obtained under microwave radiation at 1500 W has been reported. In Figure 3.20 the same data have been plotted. As illustrated in Figure 3.16 the thermal profile, followed by the epoxy system during microwave cure process at 1500 W is reasonably well comparable with the temperature trend during a dynamic scan at 44 ◦ C/min up to 125 s, corresponding to a degree of conversion of 81,42 %. Therefore the comparison with conventional 122
Results and Discussion 123 t MW [s] 50 75 100 125 150 175 T MW [ ◦ C] 61 80 95 104 – – α MW [%] 3,36 25,15 31,61 81,42 91,10 ≈ 100 Table 3.13: Time, temperature max and degree of conversion for MW cure at 1500 W. Figure 3.20: Degree of conversion against reaction time for MW cure process at 1500 W. 123
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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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Page 77 and 78: Experimental 77 not read the water
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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
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Page 91 and 92: Experimental 91 2.6.3 Influence of
Page 93 and 94: Chapter 3 Results and Discussion Th
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Page 97 and 98: Results and Discussion 97 Figure 3.
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Page 107 and 108: Results and Discussion 107 where k
Page 109 and 110: Results and Discussion 109 Kinetic
Page 111 and 112: Results and Discussion 111 Figure 3
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Page 117 and 118: Results and Discussion 117 Tables 3
Page 121: Results and Discussion 121 Figure 3
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Page 129 and 130: Results and Discussion 129 t DSC [s
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Page 145 and 146: Results and Discussion 145 ditions.
Page 147 and 148: Results and Discussion 147 3.23 and
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Page 153 and 154: Results and Discussion 153 Flexural
Page 155 and 156: Results and Discussion 155 3.7.2 FT
Page 157 and 158: Results and Discussion 157 identifi
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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
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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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