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In Situ Spontaneous Fabrication of Tough and Stretchable Polyurethane‐Polyethyleneimine Hydrogels Selectively Triggered by CO 2
Author(s) -
Song Minju,
Choi Kangho,
Choi Inseong,
Han SooKyung,
Ryu YoungHyun,
Oh DoHyun,
Ahn GukYoung,
Choi SungWook
Publication year - 2022
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.202200423
Subject(s) - self healing hydrogels , polyurethane , materials science , ultimate tensile strength , biocompatibility , chemical engineering , aqueous solution , adhesion , prepolymer , adsorption , ionic strength , polymer chemistry , composite material , chemistry , organic chemistry , engineering , metallurgy
CO 2 ‐triggered in situ hydrogels is developed from waterborne poly( ε ‐caprolactone)‐based polyurethane (PU) dispersion and aqueous polyethyleneimine (PEI) solution without any other chemicals and apparatus (e.g., UV light). In the approach, nontoxic CO 2 in air is used as a selective trigger for the hydrogel formation. CO 2 adsorption onto PEI results in the formation of ammonium cations in PEI and the subsequent multiple ionic crosslinking between PU and PEI chains. Besides the amount of CO 2 in air, the rate of hydrogel formation can be controlled by NaHCO 3 in the PU–PEI mixture, which serves as a CO 2 supplier. The PU hydrogels exhibit tough and stretchable properties with high tensile strength (2.05 MPa) and elongation at break (438.24%), as well as biocompatibility and biodegradability. In addition, the PU hydrogels exhibit high adhesion strength on skin and injectability due to the in situ formation. It is believed that these PU hydrogels have the ideal features for various future applications, such as tissue adhesion barriers, wound dressing, artificial skin, and injectable fillers.