Poly permeability coefficients

The presence of the term y) makes the permeability coefficient a function of the solvent used as the liquid phase. Some experimental data illustrating this effect are shown in Figure 2.7 [11], which is a plot of the product of the progesterone flux and the membrane thickness, 7, against the concentration difference across the membrane, (cio — cif ). From Equation (2.28), the slope of this line is the permeability, P]. Three sets of dialysis permeation experiments are reported, in which the solvent used to dissolve the progesterone is water, silicone oil and poly(ethylene glycol) MW 600 (PEG 600), respectively. The permeability calculated from these plots varies from 9.5 x 10 7 cm2/s for water to 6.5 x 10 10 cm2/s for PEG 600. This difference reflects the activity term yj/ in Equation (2.28). However, when the driving force across the membrane is... 

Figure 2.11 Permeability coefficient, V- of n-aikanes in poly(dimethylsiloxane) as a...

Figure4.3 Oxygen permeability coefficients of poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) films of various thicknesses, as a function of aging time at 35 °C [52], Reproduced with permission of the American Chemical Society.

Figure 9-4 Partition and permeability coefficients relative to LDPE. a) partition in the systems poly-olefin/ethanol and PVC/ethanol b) permeability in polyolefins and PVC. 1 cis-3-hexenol. 2 phenyl-ethyl alcohol, 3 eugenol, 4 isoamyl acetate, 5 undecalactone.

Fig. 19. Comparison of molecular weight-normalized values of the permeability coefficients of biological membranes with similar values determined for the polyelec-trolyte complex membrane of poly(sodium styrenesulfonate) (NaSS)-poly(4-vinylben-zyltrimethylammonmm chloride) (PVBMA)70 A Aminopyrine,...

Fig. 20. Dependence of the permeability coefficient of the polyelectrolyte complex of poly(ac-rylic acid) (PAA)-polyethylenepiperazine (PEPP) for water on the imposed pressure115 . (1) [PAA]/[PEPP] = 1/1, (2) [PAA]/[PEPP] = 3/1, (3) [PAA]/[PEPP] = 10/1, (4) Cellulose...

FIGURE 9.26 Time dependence of permeability coefficients for the mixture of gases CH4/C2H4/C2H6 (71%/19%/10% mol) for the membrane based on poly-2,6-dimethyl-l,4-phenylene oxide (pressure of the mixture 5x10 Pa, 7= 298 K). (From Lapkin, A.A., Roschupkina, O.P., and Dinitch, O.M., J. Membr. Sci., 141, 223, 1998.)... 

Fig. 5 shows the effect of aging time on the permeability coefficient for oxygen in PMSP, poly(TMSP-co-PP), and PMSP/PPP blend membranes at 30°C. This figure also shows the effect of PP content in the copolymer and PPP content... 

Figure 5. Effect of aging on the permeability coefficient for in PMSP, copolymer, and blend membranes. Aging condition stored in a vacuum vessel at 30 C. PMSP ( ), poly(TMSP-co-PP) 95/5 (O), 80/20 ( ), blend PMSP/PPP 95/5 (A), and 80/20 (A).

C. Permeability coefficients of poly(vinyl alcohol) andEVAL-F fix>m different laboratories are very different according to the measuring conditions and film preparation methods because poly(vinyl alcohol) and EVAL-F are very sensitive to humidity. 

The permeability coefficients of (alkylsulfonyl)methyl-substituted poly(oxy-alkylene)s and their blends were calculated by measuring the permeability coefficients of the composite films and using the following equation (77) ... 

Figure 5. Oxygen permeability coefficients of (alkylsulfonyl)methyl-substituted poly(oxyethylene) as a function of the number of carbon in the alkyl side chains.

Table 7-3. Permeability Coefficients for Nitrogen in Poly(ethylene) and Parchment at Various Temperatures...

Table 7-5. Permeability Coefficient P, Diffusion Coefficient D, and Solubility Coefficient S of Various Gases in Vulcanized cis-1,4-Poly isoprene) at 25° C...

Poly(dimethylsiloxane) has the highest permeability coefficient given by a large diffusion coefficient among industrial membrane materials, since it is composed of very flexible Si-0 linkages and has large free volume. However, it also has the lowest O2/N2 permeation selectivity value for membrane polymers, that is, P02/PN2 = 2. 

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