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Find below diffusion and water vapour transmission rates of some vapours in polymers. This is a small selection of the total available experimental figures.
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Process Conditions |
System Temperature: |
37 degrees Celsius |
| System Pressure: |
1 Bar |
| Activity of Permeant: |
40% and 90% |
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Polymer |
Permeant, Activity
|
Solubility
(vapour) |
D0* |
D|** |
Permeability
|
[-] |
[-],[%] |
m3stp /
m3 x bar |
m2 / s |
m2 / s |
[m3stp / m3] x [m2 / s] |
gram
/ m s |
Thermosets |
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Unsaturated Polyester Resin
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Water, 40% |
2 102 |
4 10-12 |
4 10-12 |
1 10-11 |
1 10-8 |
Water, 90% |
2 102 |
4 10-12 |
4 10-12 |
5 10-11 |
4 10-8 |
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Novolac Vinyl Ester Resin
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Water, 40% |
3 102 |
1 10-12 |
1 10-12 |
5 10-12 |
4 10-9 |
Water, 90% |
3 102 |
1 10-12 |
1 10-12 |
2 10-11 |
1 10-8 |
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Bisphenol-A Epoxy Resin
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Water, 40% |
3 102 |
9 10-13 |
9 10-13 |
4 10-12 |
3 10-9 |
Water, 90% |
3 102 |
9 10-13 |
9 10-13 |
2 10-11 |
1 10-8 |
Thermoplasts |
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High Density Polyethylene
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Water, 40% |
4 |
1 10-11 |
1 10-11 |
6 10-13 |
5 10-10 |
Water, 90% |
4 |
1 10-11 |
1 10-11 |
2 10-12 |
2 10-9 |
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Polyamide 6 |
Water, 40% |
1.1 103 |
5 10-15 |
1 10-13 |
3 10-12 |
2 10-9 |
Water, 90% |
2.8 103 |
5 10-15 |
3 10-13 |
5 10-11 |
4 10-8 |
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Polycarbonate |
Water, 40% |
3 101 |
8 10-14 |
1 10-13 |
1 10-13 |
2 10-10 |
Water, 90% |
9 101 |
8 10-14 |
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1 10-12 |
1 10-9 |
| *.. D0 is the "zero concentration" mutual diffusion coefficient interpreted on basis of Fick's 1st & 2nd Laws.
** D| is the "weighted average" mutual diffusion coefficient interpreted on basis of Fick's 1st & 2nd Laws. |
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