Micromorphology and properties of PES/MBMIF51 composites
1. College of Material Science and Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150040, China; 2. Key Laboratory of Engineering Dielectrics and Its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China
Abstract：PES/MBMIF51 composites were prepared by insitu polymerization method with 4,4′diamino diphenyl methane bismaleimide(MBMI) and phenolic epoxy resin(F51) as matrix and polyethersulfone(PES) as toughening agent. The micromorphology, the mechanical properties and the heatresisting performance were investigated. The FTIR results reveal that carboncarbon double bond and epoxy group in MBMI are involved in the crosslinking reaction, and the characteristic peaks of unsaturated double bond and epoxy group disappear. The SEM patterns exhibit that the fracture surface of the resin matrix (MBMIF51) is brittle fracture, and the fracture surface is smooth with crack developing at the same direction. With reasonable PES resin content, PES can be uniformly dispersed in the matrix to form stable twophase structure with fuzzy and interpenetrated interface between the twophases, and the section is rough with crack developing irregularly to exhibit ductile fracture. The mechanical performance show that with the increasing of PES content, the bending strength and the impact strength of PES/MBMIF51 composites are increased first with latter decreasing. When the mass fraction of PES is 4%, the maximum bending strength and impact strength are obtained with 142.27 MPa and 18.65 kJ·m-2, which are 36.3% and 63.2% higher than those of MBMIF51 matrix, respectively. The thermogravimetric properties reveal that the appropriate amount of PES can slightly improve the decomposition temperature of PES/MBMIF51 composites.
2019, Vol. 40 
