Gas Transport in Surface Grafted Polypropylene Films with Polyacrylic Acid Chains

VANINA COSTAMAGNA; MIRIAM STRUMIA; MAR LOPEZ GONZALEZ; EVARISTO RIANDE

Journal Polymer Science: Part B: Polymer Physics

Año: 2007 p. 2421 - 2421

p class="MsoNormal" style="MARGIN: 0cm 0cm 0pt; LINE-HEIGHT: 200%; TEXT-ALIGN: justify">Abstract: This work describes the grafting reaction of poly(acrylic acid) onto the surface of polypropylene films carried out with ultraviolet radiation, using benzophenone as photoinitiator and water as solvent. By increasing the reaction time, graft percentages of 3.5%, 6.5%, 12.9%, 19.8%, 29.4% and 36.0% were obtained. Micrographs of the modified films show that grafting exclusively occurs on the polypropylene films surface. The values of the permeability coefficients  of oxygen, nitrogen, carbon dioxide, carbon monoxide, argon, methane, ethane, ethylene and propane across the grafted films undergo a sharp drop. The interpretation of the permeation results suggest that radicals created in the tertiary carbons of the grafted chains by effect o