Microporous membranes, coated with side chain crystallizable, (SCC), polymers are currently used as part of a freshproduce bag to provide the permeability to oxygen and carbon dioxide, which the produce needs to continuerespiring and maintain quality. The membrane can be used to provide most or all of the requirements of produce,making it suitable for use with impermeable packaging materials or for packing very large quantities, e.g. 1000 lbs.Of produce.The membrane will also increase its permeability to oxygen and carbon dioxide with temperature to supply some orall of the increased respiration needs of produce as the temperature increases. The switch temperature of themembrane can be tailored to occur at any temperature between 0 and 68C. It potentially has applications in areasbeyond fresh produce, where a specific gas concentration is needed below one temperature, but is vented above thattemperature.
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