Abstract:  Epoxy resin matrix composite for friction material of ultrasonic motor driving was prepared by tetraglycidyl 2 4 ,4 ′ 2 diaminodiphenylmethane (TGDDM)/ methyl tetrahydrophthalic anhydride (MTHPA) filled with
polytetrafluoroethylene(PTFE) , carbon fibre , graphite , MoS 2 powder et al . The non 2 isothermal cure kinetic of this composite was studied by means of differential scanning calorimetry (DSC) . The apparent activation energy and
kinetic order of curing reaction were evaluated by Kissinger equation and Crane equation , and theoretic gelling temperature , curing temperature and heat 2 treating temperature were obtained by linearly extrapolating the curves of
peak temperature and end temperature of cure reaction vs. heating rate ( T p— β and T e— β) . The reaction order n was calculated to be about 0 1 90 independent of dimethyl benzyl amine(DMBA) dosage , and the apparent activation
energy decreased firstly and then increased with the increase of the accelerant DMBA percentage and it showed a minimum in one percent DMBA dosage. The extrapolated curing temperature ( T cure ) and heat treating temperature
( T treat ) are 130 ℃ and 153 1 8 ℃ , respectively. The Mechanical properties of ultrasonic motor , TRUMΦ2 60equipped with this epoxy composite friction material performed very well with lifetime longer than 8 000 h.