Graft copolymer purified from the emulsion is characterized by Fourier transform infrared spectra,scanning electron microscope and X-ray diffraction.Mechanical properties of cement mortars modified graft copolymer are tested and the micro-morphology is observed by SEM.Under water reduction efficiency of 25％,using sodium lignosulfonate as dispersing agents and the tributyl phosphate as defoamer,1.5％ doping content of CMC-g-PSS/PMMA can effectively improve the mechanical properties of cement mortars.As modified cement mortars cured for 7 and 28 days,flexural strength improvement of 7.99％ and 8.26％,compressive strength improvement of 25.60％ and 24.04％ are respectively obtained.These improvements of mechanical properties may be originated from the structure uniformity and compactness as the SEM characterization indicated.
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