The processability and heat-resistant properties of 7501 Cyanate ester were investigated. And the
EW220/7501 laminates were then produced through RTM process for evaluation of mechanical properties. The results
showed that the lowest melt viscosity of the resin is 87 mPa·s,and the processable time is more than 10 hours. After
being cured at 300℃,the Tg is 421℃ and the 5% decomposition temperature is 431℃. The mechanical properties of
EW220/7501 composites is well at room temperature, the tensile strength is 393 MPa,the compression strength is 356
MPa,the flexural strength is 602 MPa,the interlaminar shear strength is 43 MPa. And the retention rates of mechanical
properties at 300℃ is more than 80%.