Permeability and Barrier Resistance

Oxifluorination is a new process in which fluorine gas is thinned with nitrogen to which several percent of oxygen by volume have been added [357]. Subjecting PE to fluorine and oxygen at the same time leads to functionalization of the PE, making it impermeable. This technique permits substantially reducing the required amount of fluorine, resulting in a cost-to-performance improvement. 

The ability of a plastic to protect and preserve products in storage and distribution depends in part upon the diffusion (i.e., transport) of gases, vapors, and other low-molecular-weight species through the materials. A substance s tendency to diffuse through the polymer bulk phase is its diffusivity or diffusion coefficient (D). The rate of diffusion is related to the resistance, within the polymer wall, to the movement of gases and vapors. Two important aspects of the transport process are permeability and the migration of 

Plastics Dry Heat Autoclaving Boiling Water Radiation Gas 

The driving force for gases and vapors penetrating or diffusing through, for example, permeable packages is the concentration difference between environments inside and 

Resin Oxygen Barrier Moisture Barrier Grease Resistance Toughness Heat Sealability Cost per Cu. In. 

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Permeability and barrier resistance In the past, the usual materials used to contain food, gasoline, chemicals, perfumes, medication, and many other items that keep them from permeating or being contaminated were metal and glass. For over a century, however, plastic containers have been entering the arena of packaging. At first only certain plastics could be used, which were usually rather thick or heavy compared with what is used today. There have been various plastics that could provide permeability protection. 

DESIGNING WITH PLASTICS AND COMPOSITES A HANDBOOK PERMEABILITY AND BARRIER RESISTANCE... 

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