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One‐Shot Preparation of Thermoresponsive Comb Polyurethane Hydrogel for Both Excellent Toughness and Large Volume Switching
Author(s) -
Aoki Daisuke,
Ajiro Hiroharu
Publication year - 2021
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.202100128
Subject(s) - polyurethane , materials science , toughness , ethylene glycol , self healing hydrogels , triethylene glycol , chemical engineering , swelling , polymer chemistry , rheology , composite material , engineering
Thermoresponsive degradable polyurethane (PU) hydrogels are expected as the next‐generation biomedical devices, although they have an important trade‐off relationship between toughness and thermoresponsive properties. Tough and thermoresponsive comb PU hydrogels are prepared by one‐shot poly‐addition between hexamethylene diisocyanate, triethylene glycol tartrate ester, poly(ethylene glycol) 300 (PEG300), and glycerol. The swelling ratio change between 4 and 40 °C decreases as the proportion of PEG300 increases and is maintained at 600% switching within 30% PEG300. Moreover, the one‐shot preparation of comb PU hydrogel with PEG300 improves toughness up to 100 times compared to the original comb PU hydrogel. Rheological analysis suggests that the bimodal toughening phenomenon for the proportion of PEG300 is due to the network structure and the hydrophobic aggregation domain. This simple toughening method using a heteronetwork based on the kinetic difference of step‐growth PU is expected to apply to other chemical structures.