Dendrimers and dendritic polymers have applications in a diverse range of many fields including medical

electronics

nanotechnolody

biology and catalysis．Dendrimers are known for their well-defined

highly branched architectures that are built in a stepwise manner．Using dendrimer PAMAM (generation 4.5) as seed

the monodisperse and nano-sized polystyrene emulsions containing dendrimer PAMAM have been obtained by seed emulsion polymerization．The size and size distribution of particles were characterized by Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS)．It has been found that when PAMAM is used

the diameters of emulsion particles are much smaller than 100 nm

and the particles are nearly monodisperse

which are not easily obtained from other emulsion polymerization systems．The FT-IR spectrums showed obviously that

when PAMAM is used

there are absorption peak at ca．1670 cm-1 and stretching peak at ca．3300 cm-1 which mean that the dendrimer is included in the obtained polymer．