Electric Pulse Treatment of Cured Thermosetting Synthetic Resins

The physical and mechanical characteristics of cured synthetic thermosetting resins before and after electric pulse treatment with nanosecond electromagnetic pulses (NEMP) have been studied: water absorption, surface layer energy (surface tension), tensile strength. The efficiency of electric pulse treatment of cured polymer binders with NEMP to increase strength and reduce moisture absorption of materials has been confirmed. The optimal irradiation regime of cured resins with nanosecond electromagnetic pulses has been established: pulse repetition frequency of 1000 Hz, pulse amplitude of 15 kV, irradiation duration of 10 min. Implementing this irradiation regime with NEMP results in an increase in the strength limit of samples (for epoxy resin by 12.8%, for vinyl ester resin by 18.6%, for polyester resin by 21.1%) and a decrease in water absorption of samples (for epoxy resin by 25.6%, for vinyl ester resin by 21.6%, for polyester resin by 16.4%).