Study Of The Preparation And Performance Of Toughened Cyanate Ester-epoxy Resin/Basalt Fiber Composites

Glass fiber/epoxy resin composites have been applied as structure materials in high energy physics and nuclear physics experiments.In recent years,basalt fiber has attracted much attention owing to their high strength,excellent resistance against high temperature and radiation.This study used cyanate ester/epoxy resin systems as the resin matrix also for their excellent resistance against the nuclear irradiation,and they were toughened with Organic montmorillonite and Core-Shell Rubber?OMMT-CSR?,andtoughenedcyanateester-epoxyresin/basaltfibercompositelaminates?OMMT-CSR/CE-EP/BF?were fabricated by hot-press process.The effects of CE-EP resin toughened with OMMT and CSR,and the effects of?ray irradiation on thermodynamic properties of the composites were investigated.And the results will be a reference for the application of basalt fiber composites in irradiation environment.In this paper,the OMMT-CSR/CE-EP resin glue soluting was prepared by mechanical stirring and ultrasonic mixing.The resin curing process and hot-pressing process of composites laminates were determined by tests of DSC curves under different heating rates and resin gel time under different heat temperatures,and their process were 100?/2h+150?/2h+180?/2h+200?/2h+220?/2h and140?/5min/0Mpa+180?/1h/20Mpa+210?/2h/20Mpa+naturally cooled to room temperature.The curing behaviors and rheological properties of resin matrix toughened with different fillers were tested.The dispersion of OMMT in resin matrix was characterized through X-ray diffraction.The tensile strength and fracture toughness and fracture surface of toughened resin matrix with different fillers were determined,and the toughening mechanism was discussed,when the content of OMMT is 2 wt.%and the content of CSR is 7 wt.%,the resin matrix gives the best results.And the critical stress intensity factor(K_IC)and the critical strain energy release rate(G_IC)were improved by 45%and 117%,respectively,while the tensile strength and tensile modulus stay stable.The OMMT-CSR/CE-EP/BF composite laminates were prepared,and their flexural strength and interlaminar shear strength with different fillers were tested.It shows while the content of CSR is fixed in 7 wt.%,the 2 wt.%OMMT gives the best mechanical properties of OMMT-CSR/CE-EP/BF composite laminates.The interlaminar shear strength was improved by 16.5%than none OMMT composites,and bending strength and bending modulus was improved from 753.8 MPa and 32303.1MPa?none OMMT?to 840.5 MPa and 32303.1 MPa,respectively.Finally,the toughened cynante ester-epoxy resin matrix and their basalt fiber composite laminates were irradiated with 0 MGy,0.5 MGy and 1 MGy dose,respectively and their thermodynamic performance were tested.The results show that the addition of OMMT reduced the ray irradiation effects on thermodynamic performance of the resin matrix.Infrared analysis results show that the CE-EP resin matrix internal molecular structure have no obvious change.When the irradiation dose were 0.5 MGy and 1 MGy,OMMT-CSR/CE-EP/BF composite laminates'interlaminar shear strength increased by 19.3%and 19.3%,respectively,and the bending strength and bending modulus only decreased by 1.7%and 3.8%,respectively.