Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 39, Issue 14, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201700806
Keywords
dual crosslinks; mechanical properties; physical hydrogels; shape memory
Categories
Funding
- Natural Science Foundation of China [21422406, 51773179]
- Natural Science Foundation of Zhejiang Province, China [LR16E030003]
- State Key Laboratory of Chemical Engineering of China [SKL-ChE-16Z]
Ask authors/readers for more resources
Constructing dual or multiple noncovalent crosslinks is highly effective to improve the mechanical and stimuli-responsive properties of supramolecular physical hydrogels, due to the synergistic effects of different noncovalent bonds. Herein, a series of tough physical hydrogels are prepared by solution casting and subsequently swelling the films of poly(ureidopyrimidone methacrylate-co-stearyl acrylate-co-acrylic acid). The hydrophobic interactions between crystallizable alkyl chains and the quadruple hydrogen bonds between ureidopyrimidone (UPy) motifs serve as the dual crosslinks of hydrogels. Synergistic effects between the hydrophobic interactions and hydrogen bonds render the hydrogels excellent mechanical properties, with tensile breaking stress up to 4.6 MPa and breaking strain up to 680%. The UPy motifs promote the crystallization of alkyl chains and the hydrophobic alkyl chains also stabilize UPy-UPy hydrogen bonding. The resultant hydrogels are responsive to multiple external stimuli, such as temperature, pH, and ion; therefore, they show the thermal-induced dual and metal ion-induced triple shape memory behaviors.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available