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A few physical properties of grafted polyethylene and nylon films
Author(s) -
Hayakawa Kiyoshi,
Kawase Kaoru,
Yamakita Hiromi
Publication year - 1974
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.1974.070180519
Subject(s) - crystallinity , grafting , materials science , polyethylene , polymer chemistry , chemical engineering , polymer , nylon 6 , composite material , engineering
Methyl methacrylate, vinyl acetate, or N‐vinylpyrrolidone was graft‐copolymerized onto low‐density polyethylene or nylon 6 film by simultaneous irradiation method. Higher extent of grafting was attained by liquid‐phase grafting than by vapor‐phase grafting. The relative change in the degree of crystallinity of backbone polymer caused by grafting was measured with differential scanning calorimetry. In polyethylene‐g‐vinylpyrrolidone, the degree of crystallinity decreased markedly with the extent of grafting. However, in other grafted films, especially in grafted nylon, the crystallinity decrease was limited, or substantially no decrease was observed in a few systems. Water vapor permeability of the grafted films changed uniformly with increasing extent of grafting, and particularly polyethylene‐ and nylon‐g‐vinylpyrrolidone films showed excellent permeability, and some were able to be used as dialyzer. The difference in grafting method, liquid‐phase grafting or vapor‐phase grafting, produced no difference in those properties. The grafting was found to bring about a change in the molecular orientation of the original film.