Throuugh ultrasonic emulsifier-free emulsion polymerization

no chemical initiator and emulsifier

a eopolymer latexes of BA(butyl acrylate)／St(styrene)／AM(acrylamide)was prepared．The influence of ultrasonic time on monomer conversion

latex particles size and latex viscosity was investigated．A polymerization mechanism of ultrasonic emulsifier-free emulsion polyrnerization also was proposed

which indicated that AM was as an initiator and stabilizer in the reaction system．TEM photographs showed that the size of latex particles was about 80 nm

which was less than that(about 140 nm)of the particles prepared by conventional emulsifier-free emulsion polymerization method．And FTIR spectrum showed that after extracted in turm by water

CCl3 and THF for 48h

respectively

the sample obtmned by this way was a ternary copolymer of BA

St and AM

but not the blend of poly(butyl acrylate)

polystyrene and polyacrylamide．