CO2 permeability coefficients

Figure 8.1 ideal CO2/CH4 selectivity (a(C02/CH4)) of 6FDA-based polyimide-silica hybrid membranes plotted against CO2 permeability coefficient attached number represents silica content (wt%) in the membrane... 

Table 13.4 CO2 permeability coefficient of different Pebax grades and values of the CO2...

In the case of our plasma-modified membrane where amine groups were only grafted on the surface, CO2 facihtated transport cannot occur through the membranes. Instead, the high interfacial concentration in CO2 served as entrance concentration for the classical diffusion through the umnodified Pebax 1657 polymer, leading to an overall improvement of the CO2 permeability coefficient. 

Because PLA finds a lot of applications in food packaging, its barrier properties (mainly to carbon dioxide, oxygen and water vapour) have been largely investigated [4]. The CO2 permeability coefficients for PLA polymers are lower than those reported for crystalline polystyrene at 25°C and 0 per cent relative humidity (RH) and higher than... 

Figure 7.17 Influence of porous aromatic frameworks (PAFs) on the CO2 permeability coefficient of different glassy polymers, polyftrimethylsilyl propyne) (PTMSP), PMP, and polymers of intrinsic microporosity (PIM)-l, with respect to the aging phenomenon.

Figure 2.2 Comparison of CO2-CH4 selectivity versus CO2 permeability coefficients of some fluorinated poly(arylene ether) membranes. Values taken from Refs [65,90,91,102,111,115].

Table 2 presents the CO2 permeability coefficient values as a function of temperature in the range of 25-45°C at 0% RH. The activation energy was calculated according to the Arrhenius equation (25). 

Oxygen and carbon dioxide levels in modified atmosphere packages (MAP) change as a function of the respiration rate of the produce, temperature, the characteristics of the film and especially the 02and CO2 permeability coefficients of the package materials [2]. 

TABLE 123 CO2 Permeability Coefficients of PLA and Some Conventional Polymers at 23 and 30° C... 

Figure 5. CO2 permeability coefficient versus (l+bp) These data are replotted from the closed symbols in Figure 4.

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