Poly(ether ether sulfone) (PEES) containing semi-aromatic polyamides with methylene units and ether linkage were synthesized through the copolymerization of m-dihydroxybenzene, 4,4-dichlorodiphenylsulfone (DCDPS) and 1,6-N, N-bis(4-fluorobenzamide) hexane (BFBH) by the method of nucleophilic polymerization. The inherent viscosities of the resultant different proportion of copolymers were in the range of 0.39-0.78 dL/g. These copolymers were found to have excellent thermal properties with glass transition temperatures (T-g) of 121-177 degrees C, and initial degradation temperatures (T-d) of 417.5-432.5 degrees C. These copolymers showed good mechanical properties with tensile strengths of 45-83 MPa, storage modulus of 1.8-2.6 GPa. The complex viscosities of pure Poly(ether ether sulfone) (PEES) was in the range of 176,000-309.8 Pas from 0.01 to 100 Hz, the complex viscosities of the copolymers decreased significantly with the increase of semi-aromatic amide content, the copolymers of 20% decreased from 4371 to 142.4 Pas (from 0.01 to 100 Hz), and the copolymers of 70% dropped from 634.6 Pas to 55.97 Pas (from 0.01 Hz to 100 Hz). All copolymers exhibited non-Newtonian and shear-thinning behavior. These results suggested the resultant copolymers possess better melt flowability that is beneficial for the materials' melt processing. POLYM. ENG. SCI., 56:44-50, 2016. (c) 2015 Society of Plastics Engineers