For severely burned victims, artificial skin substitutes offer one of the best m

Question

For severely burned victims, artificial skin substitutes offer one of
the best means to temporarily replace lost tissues and minimize
the formation of scars. BioBrane (see Figure 2), a polymer (nylon),
is one of the most effective skin substitutes to date.

(a) Consider the diffusion of water through a BioBrane membrane
2 mm thick. The pressure difference across the membrane is
maintained at 650 Pa. Assuming conditions of steady state and a
permeability constant of 5000 x 10-6 (cm3 STP)(cm)/(cm2-s-Pa),
what is the diffusion flux in [(cm3 STP)/cm2-s] at 298K?

(b) Under which of the following circumstances would polymers likely to fracture in a brittle
manner? (Circle the right answer(s))
(i) At elevated temperatures
(ii) Be subjected to low strain rates
(iii) In the presence of sharp notches

Explanation / Answer

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