Abstract
The depletion of alkylamine terminal groups at the vacuum-polymer interface is measured for α,ω-difunctional poly(dimethylsiloxane) oligomers by XPS. The degree of surface end group depletion, within the maximum sampling depth probed (ca. 7 nm), is found to be on the order of 40% for a 960 molecular weight oligomer and decreases slightly with an increase in the oligomer molecular weight. Angle-dependent measurements are applied to determine end-group concentration depth profiles. End-group depletion is largest at the shallowest sampling depths and decays rapidly toward the bulk
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