Consider a DVD similar to that of .99. Toprotect sensitive
Chapter 14, Problem 14.49(choose chapter or problem)
Consider a DVD similar to that of 5.99. Toprotect sensitive information within the storagemedium, a very thinfilm of reactive polymer isembedded within the polycarbonate at a distanced?0.5 mm from the surface. The thin film canundergo a chemical reaction with oxygen duringwhich it is converted from a transparent material to anopaque material, rendering the information unread-able. The chemical reaction begins when the oxygenconcentration at the reactive polymer reachesCcrit?5?10?5kmol/m3. The DVD is shipped in anoxygen-proof pouch; determine the elapsed time afterremoval from the pouch before the DVD self-destructs. The solubility and diffusivity of oxygen inpolycarbonate are S?8.9?10?3kmol/m3?bar andDAB?6.5?10?12m2/s, respectively.
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