Alternating copolymer grafting onto polymer films by a vapor‐phase grafting technique

Vapor phase photografting of maleic anhydride on polymer films

“…Umezawa and Hirota (4) studied the liquid phase grafting of an MAH-styrene (St) mixture on polypropylene (PP) fiber preirradiated in air with high-energy radiation, and observed the presence of the MAH component in the grafted samples. Yamakita and Hayakawa (5)(6)(7) investigated the grafting of the solid monomer mixture, acenaphthylene-MAH, on polymer films supplying the monomers in vapor phase, which was induced by y r a y and photoirradiations. On the other hand, Ide et al (8,9) introduced MAH into PP substrate successfully by kneading PP with MAH in the presence of benzoyl peroxide (BPO) in the molten state.…”

Effect of comonomer sorption on radiation‐induced copolymer grafting onto polyethylene and EVA films in the vapor phase

“…We have studied radiation-induced grafting onto polyolefins by using sublimation vapor of solid monomers such as acenaphthylene, maleimides, etc.lV2 and found that copolymer grafting can be achieved by use of a certain electron donor-acceptor combination of solid comonomers. 2 In order to elucidate the mechanism of vapor-phase grafting onto polymer film, the supply of monomer molecules to the propagating chain ends is an important factor and, from this viewpoint, the following items should be considered: the sorption of monomer onto the polymer film; migration of the sorbed monomer molecules to the propagating chain ends; and the possibility of direct supply of the monomer molecules from the vapor phase to the propagating chain ends. 3 In the vapor-phase grafting of solid monomers onto polyolefin film, it was shown that grafting could be performed even though significant sorption of the monomers onto the polymer film did not occur.…”