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. 2021 Apr 7;3(5):2420–2431. doi: 10.1021/acsapm.1c00024

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© 2021 The Authors. Published by American Chemical Society

Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/).

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¹H NMR (400 MHz, DMSO-d₆) spectra of (A) pristine PTrisAAm, (B) APTES conjugated PTrisAAm (structural proposal of the conjugates), (C) APTES mixed with PTrisAAm, (D) ¹H–¹H-NOESY spectra (400 MHz, DMSO-d₆) of APTES conjugated PTrisAAm, and (E) APTES mixed PTrisAAm. The signal emphasized in purple in panel D shows a cross-correlation between the signals H_d-H_i, which is indicative for the formation of the APTES-polymer conjugate. In contrast, this signal is absent in panel E showing the mere mixture of the polymer and the ink, which further on solidifies the assumption that APTES binds to the polymer with proper inking conditions.