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. Author manuscript; available in PMC: 2014 Jul 8.
Published in final edited form as: Biomacromolecules. 2013 Jun 24;14(7):2225–2233. doi: 10.1021/bm400634j

Figure 4.

Figure 4

(A) Transmission FTIR spectra of PEG (3.4 kDa) diisocyanate (PEGDI) synthesized from PEG (3.4 kDa) diamine and acrylamide-PEG (3.4 kDa)-isocyanate (Aam-PEG-I) synthesized from the resulting PEGDI. (B) 1H NMR spectra of Aam-PEG-I. (C) Transmission FTIR spectra of Aam-PEG-I-functionalized collagen and Scl2-2. Ratio of 1110 cm−1 (ether) to 1650 cm−1 (amide) peaks decreases with decreasing functionalization density.