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Photoinduced grafting of acrylamide onto polyethylene film by means of two‐step method
Author(s) -
Ogiwara Yoshitaka,
Takumi Masaru,
Kubota Hitoshi
Publication year - 1982
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1982.070271010
Subject(s) - low density polyethylene , grafting , photografting , benzophenone , monomer , acrylonitrile , methacrylic acid , acrylamide , acrylic acid , polymer chemistry , materials science , polyethylene , methyl methacrylate , methacrylate , polymer , copolymer , composite material
Benzophenone‐coated low‐density polyethylene (LDPE) was grafted with acrylic acid (AA), methacrylic acid (MA), acrylonitrile (AN), and methyl methacrylate (MMA) in an aqueous medium by photoirradiation. The first‐step graft samples thus prepared with a grafting of about 50% were subjected to second‐step photografting with acrylamide (AAm). On AA‐ and MA‐grafted LDPE samples, the second‐step grafting of AAm was very smooth, and a high level of grafting up to 800% was attained with ease. On the other hand, grafted LDPE samples employing hydrophobic monomers, AN and MMA, had a lower percent of grafting than those with hydrophilic monomers, AA and MA. By ESR study, a thermally stable radical was found in the first‐step graft sample irradiated with light of λ > 330 nm. Mechanisms for the formation of such a radical in the first‐step graft sample are proposed, and the contribution of the radical to the second‐step grafting is discussed.