Journal
POLYMER DEGRADATION AND STABILITY
Volume 91, Issue 9, Pages 1960-1963Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2006.02.014
Keywords
compatibility; syntactic polysulfide; Viton A; degradation mechanisms; headspace solid phase microextraction (SPME)
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Headspace SPME GUMS was used to monitor the volatile degradation products generated by syntactic polysulfide alone and in the presence of Viton A at elevated temperature. This approach allowed the identification of products from two distinct degradation mechanisms. In one degradation mechanism, which is associated with lead oxide-cured polysulfide, a single cyclic disulfide compound dominated the outgassing signature. The second mechanism was evident only when the polysulfide was in the presence of Viton A at 70 degrees C. In as little as 24 h, the Vitonexposed polysulfide generated multiple outgassing species indicative of an acid-catalyzed degradation process. Within one week of exposure to Viton A, the syntactic polysulfide softened significantly and lost over 6% of its initial mass, and after four weeks, the polysulfide was no longer a solid material. (c) 2006 Elsevier Ltd. All rights reserved.
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