Effect of thermal crosslink conditions on dynamic mechanical behaviors of flexible epoxy

Abstract

The dynamic mechanical behavior of a new kind of flexible epoxy FE-1, which was crosslinked under four different thermal crosslink conditions, was studied. Dynamic mechanical measurement was carried out from 10 °C to 120 °C, and loss factor, tan δ and the storage modulus as functions of temperature were presented under five different frequencies of 0.1 Hz,1 Hz,5 Hz,50 Hz and 100 Hz. The experimental results show that temperature has dramatic effects on the dynamic mechanical behavior of flexible epoxy. Compared with other common available epoxy, the flexible epoxy has higher loss factor over broad frequency and common temperature range. Activation energy corresponding to glass transition process of FE-1 was calculated from the temperature corresponding to tan δ _max values, obtained at different measurement frequencies. The maximum value of loss factor is 0.75 and the T _g varies from 6 °C to 50 °C, indicating the flexible epoxy can be used as damping polymer materials at common temperature or frequency range.

Keywords

flexible epoxy / dynamic mechanical properties / glass transition activation energy

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