Reduction hydrogen diffusion during

In order for the water to affect hydrogen bonding within the urethane, the water must first diffuse into the pad material. The diffusion coefficient of water in a film (nonporous) of polyurethane has been measured as approximately 1x10 cmVsec. The diffusion constant is important because it determines how rapidly water will affect G. In the case of the IClOfX) pad (Figure 4.21), a sharp decline in G (almost a 2x reduction) is experienced during... 

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