In this work, carbon nanotubes (CNT)/polyethersulfone (PES) polymer composites were prepared by selective laser sintering, and the effects of microwave treatment on mechanical properties and tensile fracture surfaces of the composites were investigated. The experimental results indicated that tensile strength and bending strength of the composites upon microwave treatment for 5–25 s were improved by 4–20.4% and by 4.5–47.7%, respectively. The tensile fracture surface morphology of the composites depended on the time length of microwave treatment. Upon microwave treatment, the fracture surface showed fewer pores and better interfacial bonding between adjacent polymer particles. The fracture mechanisms for the microwave-treated carbon nanotube/polymer composites prepared by selective laser sintering were discussed.
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