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Additional resources for Epoxy Resins and Composites 4
The work of Huraux, Soualmia, and Sheppard has demonstrated that it is possible to make a quantitative interpretation of the £r values (within the limits of an admittedly difficult theory), and that the £r value is directly linked to the chemical changes during cure. However, because of the complications introduced by dipole correlations, the relaxed permittivity is not a useful tool for routine quantitative determination of polar reactive group concentrations during cure. , the oe-transition between the unrelaxed and relaxed permittivity, with its associated loss-factor peak.
29. low a high a high Tg Fig. 29. Schematic illustration of the temperature dependence of the conductivity during two points of an isothermal thermoset cure. (Reprinted from Ref. 35) with permission of the Massachusetts Institute of Technology) I' 'cure 1/T- Dielectric Analysis of Thermoset Cure I I 10" i I \t1 It ,-10 10 e \\ + o es 10' o 39 1: i¡ +__ - 1 11 •12 1 1 1 + — I "O C + ! \1 o o 10" 14. it •16 a 10" ! 1 1 4- i 10 v ni 100 i 1 h 1000 1 10 Time (mini b 100 - 1: 1 1000 Fig. 30a. Conductivity data of Acitelli for the 5?
K. N. 4, New York, Plenum Press 1970 28. : Polar molecules, New York, Chemical Catalog Co. 1929 29. Cole, K. , Cole, R. : Dispersion and absorption in dielectrics I. Alternating current characteristics, J. Chem. , 9, 341 (1941) 30. Davidson, D. , Cole, R. H. : Dielectric relaxation in glycerine, J. Chem. , 18, 1417 (1950) 31. , Watts, D. C : Non-symmetrical dielectric relaxation behavior arising from a simple empirical decay function, Trans. Farad. Soc, fifí, 80 (1970) 32. Williams, G„ Watts, D.