PEBA Polyether Block Polyamide

Ji et al. (1995) studied the influence of hydrophobic adsorbent (such as activated carbon) into polymeric polyether-block-polyamide (PEBA) membranes for 1,1,1-trichloroethane (TCA) removal from water by PV. It is already known, in fact, that carbonaceous adsorbents can be successfully used for the removal of small amounts of chlorinated organic compounds from water. TCA flux increases with feed concentrations (from 40 to 300 ppm) for PEBA membranes filled with both tested activated carbon WPX (a powdered adsorbent produced by Calgon Carbon Corporation, PA) and carbonaceous adsorbent Amersorb 1500 (Rohm and Hass Co., PA). The separation factor increases for membranes filled with activated carbon in comparison with unfilled membranes (axcAffl20= 1742 and 2720 for pure and PEBA membranes filled with 10 wt% activated carbon, respectively). However, membranes filled with Ambersorb 1500 do not show any improvement in the separation factor (o tca/h20= 1681). 

SAN-grafted EPDM is available commercially for making styrenic blends and PVC compositions, and polyether-block polyamides (PEBA) have been promoted for polyamide blends. 

PEBA thermoplastic polyamide rubber, polyether block amide... 

PEBA exhibit a two-phase (crystalline and amorphous) structure and can be classified as a flexible nylon. Physical, chemical, and thermal properties can be modified by appropriate combination of different amounts of polyamide and polyether blocks [149], Hydrophilic PEBAs can be prepared which can have specific applications in medical devices. Similarly to other thermoplastic elastomers, the poiyamide-based ones find applications in automotive components, sporting goods conveyor belting, adhesives, and coatings [150]. In recent years the world consumption was approximately 6400 tons per year with about 80% in Western Europe and the rest equally split between the United States and Japan [143],... 

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. 

Polyamide TPEs are usually either polyester-amides, polyetherester-amide block copol5nners, or polyether block amides (PEBA) (see Fig. 3.7). PEBA block copol5nner molecular architecture is similar to typical block copol5nners. The polyamide is the hard (thermoplastic) segment, while the polyester, polyetherester, and polyether segments are the soft (elastomeric) segment. ... 

This growing family of thermoplastic elastomers, known generically as polyether block amides (PEBA), is comprised of rigid polyamide blocks and flexible polyether blocks. 

The PEBA are produced by a aiolten state polycondensation reaction of a dicarboxylic polyamide and a polyether diol. The reaction of the rigid polyamide (hard) segments and amorphous polyether (soft) segments in the presence of heat, vacuum and catalyst yields the polyether block amide with the general formula shown below. 

Due to the diversity of polyether block amide thermoplastic elastomers that can be produced, a discussion of their specific properties would be a rather lengthy exercise. Even to list the properties of all the possible combinations of a particular set of polyamide and polyether segments could prove cumbersome as the amount of either segment in the copolymer may vary between ten and ninety percent. Therefore, a discussion of the properties of PEBA can be best accomplished by citing overall performance characteristics and ranges of values. Several properties worth noting include ... 

Tkble 3. Physical properties. See Table 1 for Samples A, D, G, I. Samples K and I hydrophilic PEBA grades with PEG as polyether block, and PA12 and PAG as polyamide block,... 

There are a few additional families of block copolymer elastomers with similar chemistry, but with minor differences. These families include polyamide elastomers (PAE) and polyether-block-amide elastomers (PEBA). 

Polyamide based Polyether Block Amides (PEBA)... 

The membrane material is decisive for the removal efficiency. Urkiaga et al. [129] tested different commercially available membranes on their adsorption characteristics for MTBE showing that sihcone rubber was more efficient than polyether-polyamide block-copolymer membranes (PEBA) and polyoctyl methyl siloxane membranes (POMS) at MTBE concentrations of 250mg/L and 1250 mg/L. The studies by Keller et al. [128] and Vane et al. [130] used polypropylene and silicone rubber membranes, respectively. 

PEBAs are plasticizer-free TPEs. The soft segment is the polyether and the hard segment is the polyamide (nylon). They are easy to process by injection molding and profile or film extrusion. Often they can be easily melt-blended with other polymers, and many compounders will provide custom products by doing this. Their chemistry allows them to achieve a wide range of physical and mechanical properties by varying the monomeric block types and ratios. 

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