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X-ray photoelectron core-line spectra recorded for a series of PTBAEMA brushes (each of 18 nm dry thickness). (A) C1s spectrum obtained for a linear PTBAEMA brush. (B) C1s spectrum obtained for the same surface-cross-linked PTBAEMA brush prepared using PPG-TDI in n-hexane. (C) C1s spectrum obtained for the same uniformly cross-linked PTBAEMA brush prepared using PPG-TDI in THF.
