The hydophobic recovery properties of polydimethylsiloxane (PDMS) elastomers after environmental degradation arises from the migration of low molecular weight siloxanes from the bulk to the surface. MALDI-TOF-MS analysis of the isotopic distribution of oligomers from the surface of vulcanized PDMS has enabled unambiguous assignment of these as predominantly cyclic siloxanes ranging from 13 to 47 repeat units with smaller proportions of methyl and hydroxyl terminated linear chains ranging from 12 to 24 repeat units.
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Hunt et al. (2000) studied this question.
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