Resumen:
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ABSTRACT: The modification of polyethylene by the grafting of poly(acrylic acid) onto
the surface of one of the faces of low-density polyethylene films with UV radiation is
reported. The transport of oxygen, nitrogen, carbon monoxide, carbon dioxide, methane,
ethane, ethylene, propane, and argon across surface-modified films containing
3.7% poly(acrylic acid) has been investigated at several temperatures. The layer of
poly(acrylic acid) grafted onto the surface of one of the faces of the films reduces the
permeability coefficient of the gases by a factor of about 1/6. The sharp drop in the
gas permeability as a result of the poly(acrylic acid) layer may arise either from the
formation of ordered str