Study On The Modification Of Carbon Fiber/BMI Composites By Using Montmorillonite

In this paper, the properties of BMI resin were modified by organomontmorillonite. TheOMMT/BMI nanocomposites were prepared by intercalating compounding method. Thecarbon fiber reinforced OMMT/BMI composites and the glass fiber reinforced OMMT/BMIcomposites were prepared. The effects of organomontmorillonite content on the performancesof OMMT/BMI nanocomposites were studied. The XRD、FT-RI and SEM techniques wereused to characterize the structure of OMMT/BMI nanocomposites. The fracture surfacefeatures of nanocomposites were observed by SEM photographs.The results showed that the addition of organic montmorillonite significantly increasethe mechanical properties of the OMMT/BMI nanocomposites. With the increase of thecontent of organic montmorillonite, the bending strength, bending modulus and impactstrength of nanocomposites increased firstly and then decreased. When the content of organicmontmorillonite was1%, the bending strength and bending modulus of the materials reachedthe maximum of143MPa and4.47GPa respectively, improved20.3%and32.5%comparedto those of neat BMI resins, respectively. The using temperature of the nanocomposites wasgreatly improved. The XRD and TEM results showed that the organomontmorillonite layershave been exfoliated and were evenly dispersed in the resin matrix.The study indicated that the mechanical properties of the carbon fiber/glass fiberreinforced OMMT/BMI multi-scale composites. When the OMMT content is1%, theinterlaminar shear strengths of carbon fiber composites and glass fiber composites reached themaximum of95.12MPa and91.4MPa respectively, improved19.2%and40.2%compared tothose of neat composites. The fracture morphology of materials indicated that the interfacialbonding properties were improved significantly by the introduction of organomontmorillonite.