As we know that , water molecules start to fill the free volume of the polymer, after the free volume is completely filled with water then it will increase the size and the lead to swelling polymer.
Hi Pankaj
What do you mean by dose rate?
they are different but you can not measure them separately. swelling defined for cross-linked polymer and measure by tea bag Technic.
gas permeability is very important property for polymer materials which used as proton exchange membrane for fuel cell
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