Surface Modification of Fine Particle by Plasma Grafting in a Circulating Fluidized Bed Reactor under Reduced Pressure

The present invention relates to a method of inducing radical formation of a surface of polystyrene particles according to each plasma condition change by generating plasma, and plasma grafting polyethylene glycol at a surface of activated polystyrene particles in a circulating fluidized bed reactor which can be operated in depressed conditions. Radical formation and grafting yield of a surface of polystyrene particles are increased according to an increase in plasma processing time, maintain a certain level, and are rather reduced when excessively processed. While plasma power is increased, radical formation is increased, and additionally radical formation is reduced according to an increase in particle circulating speed. Moreover, a surface can be grafted by using a polyethylene glycol monomer on a plasma processed particle.