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A method for determining the permeability and solubility of sulfur in poly(dimethylsiloxane) (RTV) by G. DiGiacomo; E. Spaulding is a Materials Science article available to read on EtoBox.

What is A method for determining the permeability and solubility of sulfur in poly(dimethylsiloxane) (RTV) about?

A method has been devised whereby the Sg permeability and solubility in silicon resin are determined by observing the reaction between sulfur vapors and silver particles within the polymer. The particles (-10 ym diameter), which may vary between 0.1 and 100 pm in diameter, are dispersed in the polymer at a concentration up to 20% within a glass cylinder (also an aluminum container). The polymer is cured according to procedure and exposed to Sg saturated vapors a t various temperatures (55'-125OC), leaving one end of the cylinder open. The Ag particles are a perfect sink for sulfur, which is consumed as soon as it reaches the reaction boundary that separates the reacted and unreacted Ag particles. Consequently, a distinct black region containing Ag,S product is left behind as the boundary advances. The line displacement, measured a t time intervals for the several temperatures, is used to calculate the gas permeability in the polymer as a function of temperature on the basis of a mass transport model developed from diffusion theory. The Sg solubility in the polymer is calculated from the permeability and diffusivity. The latter is determined independently by measuring the time that

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Author

G. DiGiacomo; E. Spaulding

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0021-8995)

Published

1979

Language

EN

Field

Materials Science (Physical Sciences)