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CHI TSUNG-NAN, WEI NAN-YI. DYNAMIC MECHANICAL PROPERTIES OF EPOXY RESINS[J]. Acta Polymerica Sinica,
;1964, 6(2): 103-107.
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The dynamic mechanical properties of epoxy resins cured with maleic anhydride have been studied over the 25—250℃ temperature region using a vibrating reed method．The temperature dependence of Young’S modulus and the internal fric-tion for the cured epoxy resin is typical for a slightly crosslinked polymer． A pronounced dispersion rigion is noted near 150℃ (which varies with the degree of cure)，and is accompained by a prominent drop in Young’S modulus in this region．The loss peak is due to the glass transition in the epoxy resin network since above this temperature the specimens exhibit a rubberlike behaviour． Results presented here agree well with those of other investigators．However．the glass transition temperature deter-mined bv internal friction peak is much higher than that determined from the thermo-mechanical curves by Kargin et al.，this difference suggests that the external force applied during a thermo-mechanical curve determination may produce certain mechano-chemical effects in the epoxy resin network．Experimental data obtained on the relation between the degree of crosslinking and the glass transition temperature are given and discussed．
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