Microstructure, mechanical properties and heat-resistance properties of bismaleimide composites modified synergistically by alumina and two kinds of thermoplastic resins

Abstract

Al2O3-PES-SPEEK/MBAE composites has been prepared, polymer matrix (MBAE) was obtained with 4,4’-diamino diphenyl methane bismaleimide (BMI) as reaction monomer, 3,3’-diallyl bisphenol A (BBA) and bisphenol A diallyl ether (BBE) as the reactive diluent, and two kinds of thermal plastic resins (polyether sulfone PES and sulfonated poly(ether ether ketone) SPEEK) as the reinforcements, nano-alumina (Al2O3) prepared by Sol–Gel method as the filler. The microstructure of SPEEK, Al2O3 and the composites were characterized, the mechanical properties and heat resistance of the composites were also studied and analyzed. The results reveal that there are sulfonic acid groups in SPEEK structure and the microstructure is more loose, and the degree of sulfonation is about 41.3%. Al2O3 is a nano-sized short-fibrous crystal with hydroxyl groups on its surface. The micromorphology of Al2O3-PES-SPEEK/MBAE composites show that the proper amount of PES, SPEEK and Al2O3 are uniformly dispersed in the matrix resin, which improves the fracture surface morphology of the composite, the shape of the section is fish scale and the fracture cracks are irregular and divergent, and the composites are ductile fracture. The mechanical properties indicate that the flexural strength, flexural modulus and impact strength of the composite is the maximum value 172.9 MPa, 4.7 GPa and 21.4 kJ/m2, which is 73.1%, 74.1% and 125.3%, higher than the matrix resin, respectively, when the PES content is 3 wt%, 2 wt% SPEEK and 3 wt% Al2O3 in the composite. At this time, the thermal decomposition temperature of the composite material is 453.5°C, which is 15.4°C higher than that of the matrix resin, and the mechanical properties and heat-resistance properties of the Al2O3-PES-SPEEK/MBAE composite are significantly improved.

Characterization of Mechanical, Electrical and Thermal Properties of Bismaleimide Resins Based on Different Branched Structures

“…Nanoparticles facilely agglomerate and disperse with difficulty into the resin system; the result of nanoparticles’ agglomeration is a deterioration of mechanical properties, without a toughing effect [ 17 , 18 ]. In addition, as the second phase, introducing rubber [ 19 , 20 ] thermoplastic polymer [ 21 , 22 , 23 ] into a BMI resin system is an effective toughening method; however, it results in a higher viscosity resin system. Wang et al [ 24 ] fabricated a novel BMI resin system using BMPP/BTM/DABPA with vinyl-terminated butadiene acrylonitrile (VTBN).…”

Mechanical and thermal properties of synergistic modification of bismaleimide polymer composites with nano‐SiO2 and hyperbranched polyimide

“…At the same time, they can also prevent the expansion of cracks and absorb more impact energy. [ 28 ] In addition, inorganic nanoparticles also have excellent heat resistance, [ 29–31 ] which makes nano‐SiO 2 show unique advantages in the field of toughening modification of BMI.…”