Abstract
This chapter considers the transport of gases, liquids and solids through polymer structures, as well as the transmission of light and heat. It explains how these processes can be controlled; the aim may be to minimize water transport through a low-density polyethylene damp-proof membrane or to maximize the transport of light through a fibre optic. Intermediate cases, such as the separation of salt from water in a desalination plant, require selective transport. Solid transfer through polymer sheet or film is impossible, but woven polymer tapes or fibres, or polymer grids, allow selective transfer through holes in the product. The optical transmission of films is important, while the transmission of light via fibre optics is explored because of its use in telecommunication links. Heat transmission through solid polymers uses many of the same concepts as gaseous diffusion, so is conveniently dealt with here.
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