Pebax morphology

It should be noted that Car et al. [10,11] (see also Chapter 12 of this volume) worked independently on similar blend manbranes, which were made of Pebax 1657, a grade of commercial poly(amide-b-ether) block copolymer with six polyamide blocks, and free PEG. Those membranes were also shown to exhibit high selectivity and permeability performances, which were attribnted to changes in both the chemical composition (i.e. higher EO content) and the morphological stmctuie (i.e. lower material crystallinity). On the contrary, Jaipurkar [12] observed CO2 permeability and selectivity improvements for the blend of Pebax 2533 with 25% of PEG 10000, bnt not for the blends with other PEG molecular weights or composition. 

Figure 13.5 Surface morphology of Pebax 1657 membrane obtained by AFM in contact (a) and in friction (b) modes. The contact mode images give the surface topology...

Figure 13.10 Surface morphology of plasma treated Pebax 1657 membrane obtained by...

Since the introduction of PEBAX by Atochem, many research groups have devoted much effort in the study of the morphology and properties of these copolymers, in addition to other PEBA systems consisting of various polyamides, such as nylon 6, nylon 11, nylon 12, etc., and polyesters, such as PTMO, poly (ethylene oxide) (PEO), and poly(propylene oxide) (PPO). This chapter aims to present an overview of these materials its scope is limited to the solid-state structure-property relationships and uniaxial deformation behavior of the PEBA copolymers. It is divided into two main sections. PTMO-PA12 systems are first presented and, in the second section, systems based on PEO or PTMO... 

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