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Volumetric contraction measurement method
This protocol is extracted from research article:
Wearable porous PDMS layer of high moisture permeability for skin trouble reduction
Sci Rep, Jan 13, 2021;

Procedure

The volumetric contraction is measured 3 times for the 5 specimens of the present porous PDMS layer for the fabrication conditions of varying te and WMR. The volumetric contraction is calculated using the equation of

where C is volumetric contraction, $Vb$ is specimen volume before the citric acid removal, and $Va$ is specimen volume after the citric acid removal.

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