KINETIC APPROACH TO RADIATION-INDUCED GRAFTING IN POLYETHYLENE-STYRENE SYSTEM .2.

In the reported investigation, the irradiation method reported in the previous paper was applied to four grafting reactions: preirradiation with reaction in liquid monomer, preirradiation with reaction in monomer vapor, simultaneous irradiation in liquid, and simultaneous irradiation in vapor. The increasing patterns and values of the degree of grafting experimentally obtained roughly agreed with those calculated by using the same rate constants. At high monomer concentration, the rate of grafting was small; at low monomer concentration, the rate of grafting was large. Strictly speaking, the data by simultaneous irradiation were somewhat larger than those by calculation. Two additional factors, as homopolymerization and the grafting from the radicals formed on the grafted PS, were considered and discussed. The rate constants obtained were also discussed.