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. 2020 Aug 7;12(8):1765. doi: 10.3390/polym12081765

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Structure and modification of polyethylene glycols (PEGs) [136]. (A) Structures of linear PEG and 4-arm-PEG with various functional end groups. (B) Bioactive modification of PEG hydrogels with bioactive molecules (BMs), such as cell-adhesive peptide (CAP), enzyme-sensitive peptide (ESP) and growth factor (GF), and major types of bioactive monomers from mono-, di- and multi-functionalization of BMs with various groups. (C) Fabrication of cell-adhesive PEG hydrogels by copolymerization of PEGDA and acrylic acid, followed by post-grafting of cell-adhesive peptides (CAPs) on the hydrogel surface through the reaction between the N-terminal amino groups of CAPs and the carboxyl groups provided by acrylic acid from the hydrogel. (D) Synthesis of RGD-containing PEGDA (RGD-PEGDA). (E) structure of cRGD-containing PEGDA (cRGD-PEGDA).