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- W2000530076 abstract "Dynamic mechanical measurements over the frequency range 10−4-1 Hz and temperature range 100–470 K have been made on an epoxy resin made with the diglycidyl ether of bisphenol A (DGEBA) and 4,4′-diaminodiphenylmethane (DDM) under two conditions: (i) by mechanical mixing without a solvent, and (ii) by mixing their solutions in methyl ethyl ketone. Both epoxies have three relaxations, named γ, β and α in order of increasing temperature. The effect of preparation of the epoxy from the solvent is (i) reduction of both the temperature and the strength of the γ- and α-processes, (ii) decrease in the temperature and increase in the strength of the β-process, and (iii) a two-fold reduction in the rubber modulus of the epoxy. It is shown quantitatively that the decrease in the temperature of the α-peak and of the rubber modulus are due to a lower number of crosslinks in the solvent-prepared epoxy. The strength and the temperature of the peaks change in systematic manner with the thermal history of the samples. The characteristics of the γ- and β-processes are completely recovered on reversible thermal cycling, but those of the α-process are not. Thus physical ageing also plays a role in the dynamic mechanical behaviour of the epoxy resin. The effect of ageing differs from that of thermal degradation. The G′, G″ or tan ø data could not be reduced to a master curve by a horizontal displacement alone even when the change in GUGR with temperature is taken into account. It is shown that a more discernible criterion for the validity of the time-temperature superposition is an analysis of the tan ø spectrum rather than of the G′ and G″ spectra. The fixed-frequency measurements of the dynamic mechanical properties give a lower temperature for a given rate of the α-process than do the isothermal measurements of the spectrum." @default.
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- W2000530076 date "1987-11-01" @default.
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- W2000530076 title "Dynamic mechanical behaviour and its dependence on preparation method of structural epoxide resin" @default.
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- W2000530076 doi "https://doi.org/10.1016/0032-3861(87)90036-x" @default.
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