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. 2017 Apr 21;7:46688. doi: 10.1038/srep46688

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Copyright © 2017, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(I) The ¹H NMR spectra of synthetic PEG-b-PLGA (a), acid-terminated PLGA (b), and heterobifunctional PEG (c). (II) FTIR transmittance spectra of synthetic PEG-b-PLGA (a), acid-terminated PLGA (b), and heterobifunctional PEG (c) in the wavenumber range of 500–4000 cm⁻¹.