Poly Ether Imide PEI

Fig. 23.4 Organophilic pervaporation (PV) for in situ recovery of volatile flavour compounds from bioreactors. The principle of PV can be viewed as a vacuum distillation across a polymeric barrier (membrane) dividing the liquid feed phase from the gaseous permeate phase. A highly aroma enriched permeate is recovered by freezing the target compounds out of the gas stream. As a typical silicone membrane, an asymmetric poly(octylsiloxane) (POMS) membrane is exemplarily depicted. Here, the selective barrier is a thin POMS layer on a polypropylene (PP)/poly(ether imide) (PEI) support material. Several investigations of PV for the recovery of different microbially produced flavours, e.g. 2-phenylethanol [119], benzaldehyde [264], 6-pentyl-a-pyrone [239], acetone/buta-nol/ethanol [265] and citronellol/geraniol/short-chain esters [266], have been published...

Ciba-Geigy) and poly(ether imide) (PEI, GE Ultem-1010)... 

Fig. 5 Fracture energy and glass transition temperature of poly(ether imide) PEI, A,A,A, A -tetra-glycidyl-4,4 -diaminodiphenylmethane, and diaminodiphenylsulphone. (From Ref. . )...

As a final example of the use of proton NMR invoking spin diffusion to study miscibility of polymer blends, the use of CRAMPS to remove proton dipolar coupling in a blend of an aromatic poly(ether-imid) (PEI), and a poly(aryl-ether-ketone) (PEEK), with detection of the magnetization of the C in the blend under high resolution conditions is cited [51]. Here, detailed information on the chemical composition of the phases present, as inferred from high resolution NMR of C, is linked to typical sizes of domains as reflected in spin diffusion of proton magnetization. 

PEEK is miscible with poly(ether imide) (PEI). PEI is less expensive than PEEK it is used as an amorphous thermoplastic. The kinetics of crystallization and other properties of such blends have been presented in the literature. 

In blends of PBN and poly(ether imide) (PEI), one single Tg was observed. The glass transition temperature increases monotonously with the increase of PEI content. The glass transition temperatures of the blends fit the Fox equation, indicating a mixing of the components. 

Ramiro et al. (2004) studied the behavior of injection molded specimens based on blends of poly (ether imide) (PEI) and polysulfone. The impact strength was higher than that of the poly (ether imide) alone. On the other hand, the tensile strength and elongation at break were almost additive. The reported behavior is indicative of rubber-modified blends. 

Poly(amide imide), PAI Poly(ether imide), PEI Polyimide, PI Poly(ether ether ketone), PEEK... 

Poly(ether imide), PEI. Applications electrical housings, sockets, microwave parts, bearings, gear wheels, automotive parts. 

Fig. 3.3-59 Poly(ether imide), PEI viscosity versus shear Fig. 3.3-60 Poly(ether imide), PEI stress versus strain...

The results of typical dsc heating scans after isothermal aging are shown in Figure 7 for poly(ether imide) (PEI) for various aging times (23). In this case, one sample was used for all experiments, and isothermal aging was performed in the dsc itself It is noted that if isothermal aging is performed in the dsc, isothermal calibration of the instrument must be performed. 

Finally, compression molding produces orientation profiles in a molded object. Figure 12-19 shows a birefringence vs position for samples of poly(ether-imide) (PEI) and poly(phenylene ether) (PPE). As can be seen, more rapid cool-ing (quenching) produces a more definitive profile in the polymer. 

Solution spinning is a widespread and attractive route for the production of polymer fibres, and has been applied to a variety of CNT systems. Aparticularly interesting possibility is the use of a lyotropic nematic nanotube solution as a route to a highly aligned fibre. Much of this work is directed at high loadings of nanotubes and examples include the use of surfactant-stabilised dispersions of CNTs injected into a PVA or poly(ether imide) (PEI) bath, to form a fibre that can be handled and drawn, and the use of pure SWCNT dispersions in superacid . 

The majority of the early work involving the layer-by-layer process involved inorganic substrates such as quartz and silicone since it was thought that the process required flat clean surfaces. Later on polymer films and other organic materials were used as substrates. Some of the most studied polymers include poly(propylene) (PP), poly(isobutylene) (PIB), poly(styrene) (PS), poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), poly(phenylene oxide) (PPO) and poly(ether imide) (PEI). ... 

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