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Analysis for Sulphur Pickup by Polymeric Materials

IP.com Disclosure Number: IPCOM000083307D
Original Publication Date: 1975-Apr-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Berry, BS: AUTHOR [+2]

Abstract

A sensitive test method is described for measuring small pickup levels of sulphur, with a procedure for estimating the fraction that is chemically fixed versus the fraction that is physically sorbed. A procedure is described which uses liquid scintillation counting, to obtain both the extractable and the nonextractable components of the sorbed sulphur level.

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Analysis for Sulphur Pickup by Polymeric Materials

A sensitive test method is described for measuring small pickup levels of sulphur, with a procedure for estimating the fraction that is chemically fixed versus the fraction that is physically sorbed. A procedure is described which uses liquid scintillation counting, to obtain both the extractable and the nonextractable components of the sorbed sulphur level.

The test procedure consists of first exposing the polymer sample to a sulphur source, tagged with radioactive S/35/ for the desired conditions of time and temperature. A small fragment of accurately known weight is taken from the sample, and the amount of physically sorbed sulphur is determined by extraction with liquid toluene and liquid scintillation counting.

The sample is finely pulverized to a particle size smaller than the absorption length for electrons emitted by S/35/ decay and is added to the vial containing the toluene. If the sample had picked up sulphur which had become chemically fixed, the liquid scintillation counting rate will be increased accordingly, such that the new counting rate approximates the total sulphur content.

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