AI Article Synopsis
- The surface of a blend of polystyrene types shows a depletion of both high-energy end groups and functionalized segments.
- The study uses SL-MALDI-ToF-MS, a high-tech method that can detect entire polymer chains on the surface without needing any labels.
- Interestingly, the depletion occurs despite the functional group representing less than 0.5 wt% of the total polymer chain, highlighting the unique behavior of these blends.
Article Abstract
The surface of a blend of 6 kDa polystyrene and 6 kDa polystyrene functionalized with hydroxymethyl ends not only is depleted of the higher energy end groups but also is depleted of any segments belonging to the functionalized chains. This is demonstrated using the emerging technique of surface layer matrix-assisted laser desorption ionization time-of-flight mass spectrometry (SL-MALDI-ToF-MS), which detects entire chains that have any repeat unit at the outer surface, and requires no labeling. Detecting entire chains provides information about the relationship of chain functionalization to surface segregation behavior of entire chains. That the surface is depleted of interior segments of functionalized chains as well as of the ends is remarkable, since the functionality at the single chain end involves less than 0.5 wt % of the functionalized polymer chain.
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| http://dx.doi.org/10.1021/acsmacrolett.8b00394 | DOI Listing |
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