Preparation of monodisperse polystyrene microspheres and analysis of surface morphology of its masks

Dispersion polymerization of styrene was carried out in water medium in the presence of acrylic acid using ammonium persulfate as initiator.The effects of reaction temperature,time,acrylic acid concentration,pH value and initiator concentration on the size and its distribution of polymer particles were investigated,from which an ideal recipe was found out too.There are two types of stacking existed in the surface of PS masks,the one stacked along the 〈111〉 direction for the FCC structure while the other one stacked along the 〈111〉 direction.