| Para aramid fiber is a kind of polymer material with high linear orientation and crystallization, the degree of freedom among the existing amorphous region is bigger, so there will be energy losses under the action of stress, showing the property of viscoelasticity. The strain behavior and internal motion of para aramid fiber under a certain frequency of alternating force were explored in this experiment. Results showed that as the temperature rose from low to high, three different mechanical states i.e. glassy state, rubber state and fluid state were appeared on dynamic mechanical temperature curve, due to the contribution of the fiber with high crystallinity, the initial energy storage modulus of mixed aramid paper was higher than pure fabrid paper. Hot pressing could help make the para aramid fiber recrystallization and increasing the crystallinity, so it could improve the storage modulus of the para aramid fiber. On the other hand, the dynamic mechanical analysis spectrum indicated that the compatibility of two kinds of fibers was very good. |
