Extruded Pebax Films

The CO2 extraction from flue gases would be econonucally feasible if the membranes can be produced at a low price. Pebax polymers can give an opportunity to produce low cost membranes, since they are industrially produced and are easily processable by extrusion into thin films of good quality according to the website of Arkema (www.pebax. com). Such films could be laminated onto a microporous support for a production of 

As the CO2 molecule (polarizability value of 26.5 x 10 cm, compared with 17.6 X 10 cm for nitrogen) is highly polarizable, it can interact with the polar groups in the membrane. It seems normal that Pebax 1657 is the best membrane, due to its highest content in polar ether (EO) and amide groups. However, the situation was not quite clear for the other membranes, and a more detailed study on the fine membrane structure was required. 

The detected temperature values for the first-order (endothermic peak) and the second-order transitions (heat capacity jump) (Table 13.3) were close to the values of the glass transition temperature and melting points of the pure homopolymers. The slightly smaller values of the PA and polyether melting points probably reflect the low molecular weight of the blocks and the less ordered crystallite structure. They can be therefore attributed 

Pa/PE block nature PA6/PEO PA6/PTMO PA12/PEO PA12/PTMO 

The polymer crystallinity is an important parameter in permeation the crystallites are not permeable to any species, and their distribution in the polymer materials defines the 

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General Description Elf Atochem Pebax Resins, breathable resins, are polyether block amides (PEBAs), thermoplastic elastomers made of a flexible polymer and a rigid polyamide. Extruded films made with Pebax are compact, thoroughly waterproof, and breathable. 

The influence of temperature on the transport properties of CO2 in Pebax 1657 and 6100 extruded films was studied in the 20-40 C range. Their negative sorption enthalpies (-25 and-5kJmoF, for 1657 and 6100, respectively) can be expected from fundamentals of sorption thermodynamics in polymers [40], Negative sorption enthalpy reduces the membrane selectivity for gas treatments at higher temperature. 

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