B stirring speed: if the stirring speed is too small, the particles will be larger, and the particles will agglutinate and adhere to the inner wall of the reactor or the stirring rod; If the stirring is too fast, the particles will become smaller and it is easy to produce gravel-like polymers.

The shape of the agitator.

D monomer concentration: the increase of styrene concentration will make the dispersion effect worse, and the formed polystyrene will gather together and make the particle size larger.

Dosage of component E powder: If a large amount of PVA is added, the particle size will decrease.

F coagulation speed: when the temperature gradually drops from high temperature to low temperature, the particle size of the product is relatively large.